66 327 200-4R Rear Gear? - Page 2 - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #16 of 36 (permalink) Old Jan 6th, 20, 9:27 PM
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Jim
 
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Re: 66 327 200-4R Rear Gear?

I just lock mine with a toggle switch.

Jim

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post #17 of 36 (permalink) Old Jan 6th, 20, 11:36 PM
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Re: 66 327 200-4R Rear Gear?

Hi

1//
Dansk ---Good find on the speed sensitive / 4th gear activation device . Is now preventing surging due to incorrect lock up at the wrong road speed

2//
3.73 gears for a mild cam gets the correct RPM at cruise . I say again, people who have not done gear calculations donot no and give poor incorrect recommendations

3//
Edelbrock RPM will be way better than a single plain
Performer will be to restrictive
All above depends upon cam used

4//
appropriate size carb
-----------------------------------------
NB= although I have not used mine yet I am doing almost the same . Mine is a variable pitch [VP] convertor setup. I have electronics to control this . My control unit goes between the 2 different stalls .
Going just a toggle would be a pain in the ass.
*****Strongly recommend the electronic switching

Last edited by swampy 6x6; Jan 6th, 20 at 11:52 PM.
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post #18 of 36 (permalink) Old Jan 7th, 20, 2:00 AM
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Beth
 
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Re: 66 327 200-4R Rear Gear?

Quote:
Originally Posted by CRV CRW View Post
TruTrac if you're going to keep the car and 3.73.
They don't make a tru-trac.

The choice is between a powertrax locker (very strong) or a clutch-type posi.
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post #19 of 36 (permalink) Old Jan 7th, 20, 6:31 AM
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Re: 66 327 200-4R Rear Gear?

HI
Powertrac seems to be similar to a Detroit Locker . The impression is both work off the principle of yes turning corner or no locked for drive both axles. There is no inbetween . A fibre clutch LSD is a good option for a cruiser . A clutch unit is more forgiving .
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post #20 of 36 (permalink) Old Jan 7th, 20, 8:14 PM
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Gary
 
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Re: 66 327 200-4R Rear Gear?

Quote:
Originally Posted by nashville beth View Post
They don't make a tru-trac.

The choice is between a powertrax locker (very strong) or a clutch-type posi.

https://www.eaton.com/us/en-us/catal...ferential.html

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post #21 of 36 (permalink) Old Jan 7th, 20, 8:30 PM
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Re: 66 327 200-4R Rear Gear?

Eaton doesn't make a true-trac for the 8.2 10 bolt rear.
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post #22 of 36 (permalink) Old Jan 8th, 20, 11:32 AM Thread Starter
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Re: 66 327 200-4R Rear Gear?

Quote:
Originally Posted by CRV CRW View Post
TruTrac if you're going to keep the car and 3.73.
I'm planning to keep the car forever, it has too much family history. I'd sell all of my other cars first and walk before letting it go. Because of this I'm willing to spend a little bit more on doing it the correct way. Some people direct messaged me and asked for more details (I hate it when people doesn't provide enough info, I should have done better).

The car was pulled out of a barn 2 years ago this Easter where it had been sitting for 20 years. The motor and trans were in really rough shape. It was restored in the late 80s, so I've gotten it back on the road, cautiously spending money only where necessary. The Powerglide was really struggling so last winter, it was replaced with a KZF 200-4R from an 86 Olds 442. The 200 really woke it up. Now that it's a reliable driver, I'm looking for ways to improve it while keeping/returning it's tame Malibu aesthetic.



Block casting is 3914678 from 1968
Head castings are 3782461 from 1964
Cam is unknown
Intake is Weiand Single Plane - 7546
Carb was a Carter 600, now a Holley 750 but just purchased a new Holley 600 cfm.
Eventually I'd like to do a vintage motor, looking like stock 283 but with hopped up parts. From what I hear in everyone's comments, you don't like the current motor combination, and I agree.

Here's where the thread is at.
1. 3.73 gear for the back is going to help the transmission a lot.
2. LSD for a 8.2" 10 bolt is difficult to find.
3. If rear gear doesn't fix the problem, install a switch for lockup.
4. There are 100 different ways to do something and it will be difficult to get a consensus.

1966 Malibu 327 200-4r
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post #23 of 36 (permalink) Old Jan 8th, 20, 2:33 PM
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Re: 66 327 200-4R Rear Gear?

Quote:
Here's where the thread is at...
2. LSD for a 8.2" 10 bolt is difficult to find.
I bought a 'kit' on eBay and put an LSD and 3.73's in my 8.2 last year. LSD was Yukon, the ring and pinion was Richmond, the bearings and seal kit were US Gear. I haven't had any issues, other than the pinion bearing in the kit was the wrong size, but nothing a trip to NAPA didn't fix.

I've got a Blueprint 355, Edlebrock 600, 700R4, running 27" tire. 65 MPH is around 1800-2000 rpm, I don' t really pay attention. Nice cruiser, decent on MPG.

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post #24 of 36 (permalink) Old Jan 10th, 20, 3:33 PM
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Re: 66 327 200-4R Rear Gear?

Quote:
Originally Posted by brockmub View Post
My '66 Malibu has been a ton of fun after upgrading to a 200-4R. It has a TransGo shift kit and an automatic lockup kit. Gears 1-3 are really great but my tire and rear end combo makes OD really surge. If I put my foot in it and get to 65, it will lockup just fine, but it doesn't work so well if I drive it regularly. So I think it's time to swap out the rear gears for summer cruising and occasional burnouts.

Current setup is 327, 200-4r, 3.08 rear, 27.7" tires. The tall skinny tires are staying because I love the look, it's a total sleeper/grandma car. I'd like to keep the 8.2" 10-bolt but would love to see it do an occasional two tire burnouts. So I need to make the changes in the rear gear. My RPM spreadsheet says I had been pulling 1600rpm at 65mph (hence the surging). A 3.73 ratio would be 2000rpm at 65mph. (The 200-4r was originally in a 442 w 3.73) Do I need to go even higher rpm at 65?

Where should I go for Posi and rear gear? I'm thinking Yukon Posi and Motive 3.73 or what else should I consider? What vendors?

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Cant help with your question but I love the Chevelle...
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post #25 of 36 (permalink) Old Jan 10th, 20, 3:48 PM
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Re: 66 327 200-4R Rear Gear?

Quote:
A 4.11 gear would put you at appox. 2300 rpm at 70 mph
That sounds ideal to me....close to what a 3.08 and T350 would get him.
No need to use OD around town, highway only. Mileage wont be affected til after 60-65 I bet.

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post #26 of 36 (permalink) Old Jan 10th, 20, 3:55 PM
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Re: 66 327 200-4R Rear Gear?

A 4.11 gear with a .67 overdrive essentially gives you a 2.75 final gear ratio, the same as you would have with any non overdrive trans and 2.73s
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post #27 of 36 (permalink) Old Jan 10th, 20, 4:16 PM
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Re: 66 327 200-4R Rear Gear?

Quote:
Originally Posted by modern malibu View Post
A 4.11 gear with a .67 overdrive essentially gives you a 2.75 final gear ratio, the same as you would have with any non overdrive trans and 2.73s
Assuming no lockup. Add in lockup and it will feel even more geared down.

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post #28 of 36 (permalink) Old Jan 11th, 20, 10:07 AM
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Kevin
 
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Re: 66 327 200-4R Rear Gear?

I had a 200-4R from Art Carr and ran 4.11 and 3.73. I found that the 4.11 was better all around than the 3.73s. As stated above I would switch to a dual plane intake as well to help in the torque department. I have an 8.2 10 bolt with an Eaton LSD, The 4.11s are Yukon and the 3.73s are German made by Motive. I switched to a TKO600 a couple of years ago but for an auto the 200 is an awesome trans. As recommended by Art, it had no lock up and I never had a problem with it. TV cable adjustment is critical but I'm sure you know that.
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post #29 of 36 (permalink) Old Jan 11th, 20, 10:28 AM
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Re: 66 327 200-4R Rear Gear?

I used Richmond Excel gears in my 8.2, can't say I'd recommend them. They've lasted 13k so far with some very abusive driving but are loud. Also have the Eaton limited slip diff and do recommend it. Have had 0 problems with it and wouldn't hesitate on purchasing another to install in another vehicle. I'm big on the Zexel-Torsen style diffs, did want a true-trac but this diff is a very acceptable substitute.

Not sure if you'd want to spend the extra while your in there but if you get a stud-girdle diff cover I can tell you there's a difference in quality and engineering. I ran a Proform "Perfect Launch" cover for a while and couldn't touch the diff after a run it was so hot. I watched the Gale Banks diff cover series on youtube and ditched that cover. The cover was leaking from a casting crack so I replaced it with a Moser cover. The quality and attention to detail is gorgeous. Also the fluid path for the pinion is spot on, diff no longer heats up like with the profrom cover, even after a hard thrashing.

*Jeff*

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post #30 of 36 (permalink) Old Jan 11th, 20, 12:55 PM
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Re: 66 327 200-4R Rear Gear?

Quote:
Originally Posted by nashville beth View Post
They don't make a tru-trac.
The choice is between a powertrax locker (very strong) or a clutch-type posi.
Quote:
Originally Posted by nashville beth View Post
Eaton doesn't make a true-trac for the 8.2 10 bolt rear.
I agree with Beth

I had a Eaton Clutch Type Posi in a 12 Bolt had it Rebuilt with new Springs/Shims
and a year later it went back to a one peg leg drive

Bought a new Strange S60 with Det Truetrac/Worm type Gears in 2013
and it has been working perfectly since on the Street and at the Track

Since you have a 10 Bolt then the Powertrax would be a good choice IMO

I would/will never use a Clutch Type Posi again

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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