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Old 06-10-2012, 08:53 PM
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87 cutlass 455 v6 rear end?

hi, im 19 years old and know somewhat about cars, not alot tho. i have a 1987 2 door cutlass supreme that has the factory v6 rear end tranmission and v6 motor the buick 3.8 and im getting a friend to install a buick 455 out of a 73 riviera, but dont have money for a rear end,so i would like to know will the factory v6 rear end stand up to the tourqe of the 455 or will the rear end explode or somthing? if i dont hotrod it around and do burnouts and if i take it easy all the time will i get away with using the v6 rear end for a few mounths untill i can afford a posi? or will the v6 rear end f*ck up within a few days of having the new 455 motor in it even if i am taking it easy on it?

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Old 06-11-2012, 01:46 AM
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Originally Posted by theguesswho
hi, im 19 years old and know somewhat about cars, not alot tho. i have a 1987 2 door cutlass supreme that has the factory v6 rear end tranmission and v6 motor the buick 3.8 and im getting a friend to install a buick 455 out of a 73 riviera, but dont have money for a rear end,so i would like to know will the factory v6 rear end stand up to the tourqe of the 455 or will the rear end explode or somthing? if i dont hotrod it around and do burnouts and if i take it easy all the time will i get away with using the v6 rear end for a few mounths untill i can afford a posi? or will the v6 rear end f*ck up within a few days of having the new 455 motor in it even if i am taking it easy on it?
You can use the stock rearend if you really take it EASY. But the first time that rearend "feels" the torque- like if it gets good traction at the drag strip on a prepped launch pad- that diff is history.

The problem is, there's no cheap/easy replacement. You can google replace G-body rear end or similar terms for more info.
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Old 06-11-2012, 04:38 AM
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Don't worry about the rear end. The stock 200-4R trans MIGHT make it to the end of the driveway before it pukes. Bottom line is that ALL parts of the drivetrain must be upgraded to match the torque of the engine.
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Old 06-11-2012, 04:43 AM
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Hopefully he is getting the Riv's TH400 to swap in w/the engine.
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Old 06-11-2012, 04:50 AM
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that rear will work fine. just dont hook up full throttle or its gone.you could ease it around for a long time but thats hard to do when the power is there at your comand. lol
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Old 06-13-2012, 01:22 AM
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i do indeed have the th400 tranny from the riviera aswell, now im guessing i will probly need a diffrent lenght drive shaft right?
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Old 06-13-2012, 02:26 AM
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yep, and theres a dang good chance you'll have to do it again when you change the rearend.
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Old 06-13-2012, 07:11 AM
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Quote:
Originally Posted by theguesswho
i do indeed have the th400 tranny from the riviera aswell, now im guessing i will probly need a diffrent lenght drive shaft right?
The front yoke diameter and spline count is different between the two transmissions. If you can, hang on the the driveshaft from the donor vehicle that had the 455/TH400. From the two driveshafts, one can be made that will work- one way or the other.

There are U-joints available that will let you put the TH400 yoke onto the driveshaft out of the '87 Cutlass. I don't know what length the tailshaft is on the TH400 from the Riveria, but if it has the short 4" tailshaft, the TH400 is only around 1" longer than the TH2004R- IF you have that transmission and IF the TH400 has a 4" tailshaft.

That much length might be absorbed by moving the engine and transmission as far forward as the mounts will allow, along w/the amount of travel available at the tailshaft splines/driveshaft yoke.

Otherwise the driveshaft will need to be shortened after the TH400 front yoke is installed by the shop. You will want to have the mods done by a driveline shop who's well versed in driveshaft shortening/lengthening, though. The driveshaft has to be balanced. Shops that work on 4WD trucks usually either do this type of work or will know where to send you. A high performance transmission shop is another lead.

The transmission crossmember should be close to being in the correct position. Usually there are holes in the subframe rails for a TH400, but I'm not positive they kept putting the holes in the G-body cars through 1987, so there's a chance new holes will be needed. The tranny mount will need to looked into- I'm not sure what the TH2004R used compared to the TH400.

Last edited by cobalt327; 06-13-2012 at 07:36 AM.
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Old 06-19-2012, 02:58 PM
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i think the 7.5" 10 bolt is rated for 2,833 ft./lbs. So, take the peak torque output of the engine multiply it by first gear in the 400 trans---2.48 multipled by whatever gear ratio you got, probably a 2.56.


i think you'll be alright if you take it easy.


(also it would probably be best not to cuss on the forum )
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