Transmission Shifting Problems. - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 15 (permalink) Old Jul 7th, 19, 5:17 PM Thread Starter
Matt
 
Join Date: Nov 2018
Location: San Diego, CA
Posts: 17
Transmission Shifting Problems.

Hey All,


I went for my first "long distance" drive in the Chevelle yesterday, 42 miles round trip, mostly highway miles at between 65-70mph. Before this I was mostly driving in town. For some background here are my first two posts:
https://www.chevelles.com/forums/59-...ew-member.html
https://www.chevelles.com/forums/16-...n-rebuild.html



It was a semi-warm day, cooler towards the coast but a lot warmer inland where I live.


The car drove great! It rides smooth, doesn't drift in the lane and runs at about 2,600rpm at 70mph with the temp around 180 degrees. The drive-line is a 1986-1988 350 with a 700R4 4160E transmission and Eaton 8.2 Possi with 3.73 gears. Per some paperwork that I found with the car when I got it, both the transmission and differential were rebuilt by the same company in September of 2016, less than 500 miles ago. My father-in-law didn't drive the car much, maybe once every two months after the rebuilds.



When I pulled off the highway on the return trip I started having shifting problems. The car would go up to around 3,000rpm before shifting into 2nd gear, would almost immediately shift into 3rd, then properly shift into 4th. Luckily I was only a few miles from home and was able to baby it back the the house.


I did check ALL fluids/tires prior to the drive, everything was good. I haven't driven/started it today because I am leery/worried I might damage the transmission.


- Any thoughts on why it developed a shifting issue?
- Is there a good maintenance/rebuild book for the 700R4?
- Any recommendations on what to do next?


My thoughts right now are that I should service the transmission, new filter and fresh fluids.
- Is it actually worth taking it in and having the lines/radiator/transmission flushed? I feel that this is overkill since everything has less than 500 miles on it.


I do know that the trans fluid is making it to the radiator cooler because the trans lines are hot during/after a drive.
- Would an additional transmission cooler in front of the radiator help with cooling?


Also, are there prefabbed transmission lines available for my car? It looks like someone took some old transmission lines and hand-bent them, very amateurish looking.


As always, thank you in advance for any/all assistance/advice given.


v/r,
Matt
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post #2 of 15 (permalink) Old Jul 8th, 19, 4:44 PM
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Harold
 
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Re: Transmission Shifting Problems.

is this 86/88 700r4 -4l60 no "E"(electronic) or is it really a later year , ie 93 up, 4l60e ?
700r4 has a throttle cable that sets shift points ; 4l60e is controlled shift by the computer
much different diagnosis between the two

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post #3 of 15 (permalink) Old Jul 8th, 19, 11:55 PM Thread Starter
Matt
 
Join Date: Nov 2018
Location: San Diego, CA
Posts: 17
Re: Transmission Shifting Problems.

Hello Harold,

Thanks for your reply.

I put the -4160e info in the original message based on the paperwork from the transmission shop that came with the car.

I am not very familiar with transmissions. I just watched a video on how to tell the difference between the two models and will check tomorrow. I'll let you know what I find.

v/r,
Matt
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post #4 of 15 (permalink) Old Jul 18th, 19, 12:21 AM Thread Starter
Matt
 
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Location: San Diego, CA
Posts: 17
Re: Transmission Shifting Problems.

Hey All,

I was finally able to get some time on the car. It has a TH700r4, serial number 4MK124HT, which looks to be a 1984 transmission. It also has an Edelbrock carburetor.

I took the car out for a very short drive, less than 1/10th of a mile. The transmission will engage all gears at idle, and will start out in first but as soon as I add more than a little throttle it feels like the transmission is slipping.

I double-checked that the TV cable was not loose by the transmission pan, it's not. I double-checked that the linkage was correct at the Edelbrock carb, it is.

I researched on how to adjust the TV cable and may have found the problem. When I depressed the button on the TV cable to adjust it the button stayed "in" and the "ribbed" part moves freely in the housing. The button will not release. It seems that the TV cable may be bad.

Thoughts?

Also, where is the best place to get a new TV cable? I stopped by the local dealership to see if they had one, no joy.

Any other thoughts/recommendations/opinions are always welcome!

Thanks in advance for any assistance.

v/r,
Matt
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post #5 of 15 (permalink) Old Jul 18th, 19, 1:02 AM
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leo
 
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Re: Transmission Shifting Problems.

Try a local transmission shop and good luck!

Leo Paugh
Maryland Chevelle Club #017
A.C.E.S.#3731
progress has little to do with speed, but lots to do with direction

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post #6 of 15 (permalink) Old Jul 18th, 19, 6:29 AM
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Durand
 
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Posts: 445
Re: Transmission Shifting Problems.

The throttle cable/adjustment is ultra important on that trans.
Hate to be the bearer of bad news but you might have cooked it.

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Best 1/4 mile. 11.43 @ 118 mph
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post #7 of 15 (permalink) Old Jul 18th, 19, 11:25 AM Thread Starter
Matt
 
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Location: San Diego, CA
Posts: 17
Re: Transmission Shifting Problems.

Mornin' Durand and Leo,

I think you guys are correct. The more I research the more I feel that the transmission will need to be rebuilt.

If you have read my previous posts you know that the more I dig, the more I find that the work my father-in-law had done was less than "quality". I fear that while the transmission was supposedly rebuilt, and the TV cable was supposedly replaced with a new one and properly adjusted...both may be lies.

Here is some more 'fun' stuff that I found:

- Carb studs were too short [only a few threads available] so they put different thread pitch nuts on and over torqued them so they wouldn't back off.

- The distributor hold down was the wrong one, only one arm was holding the distributor, and held on with a header bolt.

- The majority of nuts/bots are mismatched and mixed metric/SAE.

- One that really scares me are the spark plugs. They have been installed so tightly that I can't budge them with a 1/2" ratchet.

I'm at the point where if the transmission has to be rebuilt I am considering pulling both the engine/trans and going over the engine while the transmission is being rebuilt.

Fun shtuff for sure!

v/r,
Matt
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post #8 of 15 (permalink) Old Jul 18th, 19, 4:02 PM
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Harold
 
Join Date: Feb 2006
Location: Bonham , N.E.Texas
Posts: 1,413
Re: Transmission Shifting Problems.

glass half full.....be an optimist
change the cable and get it adjusted right. If you babyed it home , trans should be ok
The odd fact here is the 3000 first shift, all shifts should have stacked up at low speed if cable adjustment failed

New paint -near complete
66 SS 396. now 427
4sp w/GV, AC,PS,3.31 Posi,ft disc,11" r drum
86 Buick Grand National
89 K25 Suburban that I bought new,is new again
And a bunch of other junk.
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post #9 of 15 (permalink) Old Jul 18th, 19, 8:11 PM
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Greg.
 
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Re: Transmission Shifting Problems.

Matt what is the purpose/use of the car ?

Just in city/local driving
or
Long Hwy Trips ??

I am not fan of 700R4s
so that being said and based on your answers to the two above questions
I would go either a TH400 3 speed Auto Trany, which is pretty much Bullet Proof
or
go with a 4L80M 4 speed Auto Trany, which means you do not need a Expensive Electronic Controler
and is pretty much Bullet Proof since it is basically a TH400 with a Overdrive

And if you have not done any Suspension Parts buying yet
after much Researching I bought these UMI Perf parts for my 67
and found them to be of the Best Quality / Fit and Finish of any of the Aftermarket parts out there IMHO

I looked at various other companies
eg. BMR Fab. / Hotchkis / Edelbrock / Hellwigs / SC & C / HRPartsNStuff / Speed Tech .....
I would have purchased the UMI Perf 64-67 GM A Body Handling Package- Stage 2 # ABF403-64
except that the kit came with 1" lowering springs
which I did not want or need as I run OEM stock Moog springs for the stock riding height.
I purchased the following from UMI Perf and found them to be
of the best looking & quality that I have ever seen/used;
1. UMI Perf 64-67 GM A Body Rear Lower Boxed / Adj Upper Control Arms # 402126
2. UMI Perf 64-72 GM A Body Solid Front and Rear Sway Bar Kit # 403534
3. UMI Perf 64-72 GM A-Body Tubular Upper & Lower Front A-Arm Kit # 403133
4. UMI Perf 64-72 GM A-Body Tie Rod Adjusters # 2103
5. UMI Perf 64-67 GM A-Body Rear Shock Tower Brace # 4059
Also I added the Rear Frame Cross Brackets.
The difference in ride quality/handling , went to firm and stable,
that I have acquired with the great parts from UMI Perf I put on from the previous original type Springs
it was a night to day type change in ride and handling response .
See the various Kits for your car here
Handling Kits : UMI Performance, Inc.

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #10 of 15 (permalink) Old Jul 20th, 19, 12:25 PM
 
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Re: Transmission Shifting Problems.

go with a 4L80M 4 speed Auto Trany, which means you do not need a Expensive Electronic Controler
and is pretty much Bullet Proof since it is basically a TH400 with a Overdrive


just wondering how you will make it shift without a computer of some kind?
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post #11 of 15 (permalink) Old Jul 20th, 19, 12:55 PM
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Re: Transmission Shifting Problems.

Quote:
Originally Posted by miketx View Post
go with a 4L80M 4 speed Auto Trany, which means you do not need a Expensive Electronic Controler
and is pretty much Bullet Proof since it is basically a TH400 with a Overdrive


just wondering how you will make it shift without a computer of some kind?

Welcome to Chevelles!


While I've never heard it called a 4L80M, it would be a transmission setup for manual control.


Every shift you need needs to be done manually by the driver with the shifter.
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post #12 of 15 (permalink) Old Jul 20th, 19, 1:24 PM
 
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Re: Transmission Shifting Problems.

Quote:
Originally Posted by paul bell View Post
Welcome to Chevelles!


While I've never heard it called a 4L80M, it would be a transmission setup for manual control.


Every shift you need needs to be done manually by the driver with the shifter.
Thanks, I was wondering what makes it shift then?
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post #13 of 15 (permalink) Old Jul 20th, 19, 1:33 PM
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Re: Transmission Shifting Problems.

Quote:
Originally Posted by miketx View Post
Thanks, I was wondering what makes it shift then?

An automatic transmission modified for full manual use will be in whatever gear you place the shifter into.


If the shifter in in second gear, the transmission will be in second gear-regardless of what speed the car is traveling at.


As you drive the car, you put the shifter in first to start, then shift up through the gears as you speed up. As you slow down, you'd need to downshift as needed.
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post #14 of 15 (permalink) Old Jul 20th, 19, 1:38 PM
 
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Re: Transmission Shifting Problems.

Quote:
Originally Posted by paul bell View Post
An automatic transmission modified for full manual use will be in whatever gear you place the shifter into.


If the shifter in in second gear, the transmission will be in second gear-regardless of what speed the car is traveling at.


As you drive the car, you put the shifter in first to start, then shift up through the gears as you speed up. As you slow down, you'd need to downshift as needed.
Thank you, I was wondering what exactly are those mods that make it shift manually like that? Is some type of shift kit used or manual valve body? Are the two shift solenoids used? And what about the torque converter clutch, is it used? What about controlling the line pressure or is it just left at maximum? Thanks.
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post #15 of 15 (permalink) Old Jul 21st, 19, 12:00 PM
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Greg.
 
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Re: Transmission Shifting Problems.

I just had my TH400 Rebuilt this Spring
went from the Normal Auto type to a Manual Shift Reverse VB Trans plus put in a new B&M Pro Ratchet Shifter

After 50+ years of Shifting the Trans as D 2 1 and the Gearing down that it did as you down Shifted

It is different to shift 1 2 D but the B&M Pro Ratchet Shift works great for doing this
and now there is no chance of going from D into Neutral when Racing down the Track

but the only thing I miss is the no Gearing down of the Trans now
as the Trany kind of floats until you push on the Gas
Trsnsmission guy said less things to go wrong in the Trany also by going Manual VB

You always need the TC in a Auto Transmission

The other answers to your questions can be Googled or ask a Transmission Expert
as I am not one of those and that is why I let my Trany Go to Guy do all the work on my car's Trany every 10 yrs
he is a exRacer NHRA Record Holder from the 60s/70s/80s and is in Canada Hall of Fame for Drag Racing
https://cdrhf.com/Inductees/doug-miller/

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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