Transmission - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 27 (permalink) Old Jan 18th, 20, 3:02 PM Thread Starter
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Steve
 
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Transmission

So the car I bought has a 383 stroker 12 bolt posi with 3:31 gears,is it worth putting in a 700R4.Beating myself up about this itís one day yes and then one day no.Any opinions would be appreciated

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post #2 of 27 (permalink) Old Jan 18th, 20, 3:14 PM
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Eric
 
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Re: Transmission

no
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1967 Olds Cutlass 468 BBC/T400
1963 Plymouth Fury 440/Torqueflite
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post #3 of 27 (permalink) Old Jan 18th, 20, 3:25 PM
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Re: Transmission

What trans is there now?
Have you run a gear/rpm calculator to see where you'll end up?
Here's one - Wallace Racing - Automotive Calculators
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post #4 of 27 (permalink) Old Jan 18th, 20, 4:59 PM Thread Starter
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Re: Transmission

It has a TH400 now and I was going to put 275/50/17 on the back and 225/50/17 on the front.I purchased the car in September but donít pick it up until April-May depending on the weather.Why do you say no oldcutlass.

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post #5 of 27 (permalink) Old Jan 18th, 20, 5:04 PM
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No
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post #6 of 27 (permalink) Old Jan 18th, 20, 5:37 PM
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Steve
 
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Re: Transmission

With that tire size and 3.31 gears youíll be turning around 2600 rpms at 65 mph.

How do you plan to drive the car? Around town with a few highway trips, lots of highway driving, etc.?

Quote:
Originally Posted by 1972SSstroker View Post
It has a TH400 now and I was going to put 275/50/17 on the back and 225/50/17 on the front.I purchased the car in September but donít pick it up until April-May depending on the weather.Why do you say no oldcutlass.

1972 Chevelle, 454, 200-4r non-lockup, 12 bolt 3.73
1981 Camaro Z28, 355, TH350, 3.73
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post #7 of 27 (permalink) Old Jan 18th, 20, 6:27 PM Thread Starter
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Re: Transmission

Few beach runs a year about an hour away and ice cream getter at night

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post #8 of 27 (permalink) Old Jan 18th, 20, 6:29 PM Thread Starter
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Steve
 
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Re: Transmission

Why no,just wondering had a couple Novas with strokers and had 700R4 in both but 1 had 4:11 and the other 3:73

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post #9 of 27 (permalink) Old Jan 18th, 20, 7:10 PM
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Steve
 
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Re: Transmission

Given that, I probably wouldnít bother (Just my opinion) with the 3.31 gears as you wonít be turning a lot of rpms all that often.

If you had the 3.73 or 4.11 gears you mention, it might be more worthwhile.

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Few beach runs a year about an hour away and ice cream getter at night
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1972 Chevelle, 454, 200-4r non-lockup, 12 bolt 3.73
1981 Camaro Z28, 355, TH350, 3.73
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post #10 of 27 (permalink) Old Jan 18th, 20, 7:54 PM
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Greg.
 
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Re: Transmission

Just run the TH400

The 700R4s are not my fav OD Trany and even if I got one Free I would not put it in my car
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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 #11 of 27 (permalink) Old Jan 18th, 20, 9:02 PM
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Re: Transmission

You couldn't pay me to run another 700R4 - ever. Either go with a 4L80E, or a Gear Vendors overdrive unit. Or, if your engine has enough torque, just drop the rear gears to 3.08 (cheaper than a new transmission).
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post #12 of 27 (permalink) Old Jan 18th, 20, 9:05 PM
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Re: Transmission

HI
What about a th200R ??? If u had to o/haul the th400 transmission it would be an option . But yes it would be probably double the cost for a built trans and lockup convertor tailshaft + bits and pieces . The lock up convertors need a control unit about 100-200$$. Stops lockup under 40mph etc etc

Convertor stall for street and economy cannot exceed no higher than 500rpm above engine speed at highway cruise
eg 65mph your car is reving 2600rpm with3.31 rear gear and 275 50 17 . eg stall no greater than say 3100rpm

Convertor and rear gear need to match your engine combo [ cam comp head ] as well

My mid range engine combo calculated 3.6 diff ,26.1 tyre, th400, revs around 3000rpm at 65mph, ,VP convertor stall= 2600/3200. With convertor control unit .
The 3.6 is as lower gearing as I would have .
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post #13 of 27 (permalink) Old Jan 18th, 20, 9:25 PM
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Quote:
Originally Posted by Kirk's67SS View Post
Just run the TH400

The 700R4s are not my fav OD Trany and even if I got one Free I would not put it in my car
Quote:
Originally Posted by WakkoWarner View Post
You couldn't pay me to run another 700R4 - ever. .
amen, Amen, AMEN 👍
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post #14 of 27 (permalink) Old Jan 18th, 20, 10:36 PM
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Re: Transmission

Quote:
Originally Posted by 1972SSstroker View Post
It has a TH400 now and I was going to put 275/50/17 on the back and 225/50/17 on the front.I purchased the car in September but donít pick it up until April-May depending on the weather.Why do you say no oldcutlass.
As others have said, with 3:31 gears its not running very high rpms even at 70mph. Spend your money on other things for the car.
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post #15 of 27 (permalink) Old Jan 19th, 20, 12:38 AM
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Re: Transmission

I have been running a 700R4 in my 70 wagon for over 41.000 miles.
So what is the problem with a 700R? I run a 3:07--12 bolt and the engine is a 468, like an LS-5, with a Q-Jet. Tires are 225 X 70R X 14".
It is my driver / cruiser. So far no issues with the 700R. But then again it has been in the wagon for 12--14 years & 41.000 miles.
The 4300 Lb. wagon goes down the road at 75 MPH, and the 468 is spinning at 1950 RPMs. I use the electronic cruise control a lot. The 468 gets 20 MPG on the I-State at 75 MPH. ( A/C not running, with A/C mileage go down 2 MPG.) I can live with 18 MPG, With 38 degrees out the center vent) For me it has been 41.000 ""SMILES"",,,,,,,,,,, NO changes are in the works !
P.S. When I built this " Purpose Built Wgn. ", I did a lot of thinking , Then I got the wrenches out! Big Orange hunk of iron,, With LOTSA CUBES, Motor home cam, Equals Big TORQUE and low RPMs. ( Just like the NEW modern Class "8" road tractors). My 1/2 ton Silverado with the Alum. 6.2-376 cu. in. is a lot faster than than 90% of the B.B.s on the road today. My Silverado 6.2 spins 5800 RPMs with the A/C running. Its all STOCK and 4WD.
YES, The moden LS engines are the Katz Azz, No doubt.... For me I just like the look of that Big ORANGE hunk, Sitting between the fenders.
Do what makes you happy....... Life is a " one way " street, Enjoy the He!! out of it !
Bob


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