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Old 09-22-2010, 08:53 PM   #1
gbodyfan
 
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Default th 400 in a g body

I tried searching but couldnt find anything. I was wondering what all is involved with putting a th400 in a g body cutlass? I have a 86 cutlass and was thinking of putting a 455 and th400 in it but was wondering what all is entailed with it.

Mainly speedo cable and drive shaft small stuff like that. I know the drive shaft will have to be made i have a couple of old drive shafts laying around might see if i can make somthing out of them. What do i need to do for a speedo will the stock cable and gear work or will i have to change it.

I am planning on using manifolds but will prob build a dual exhuast cross member so thats all taken care of. Motor mounts prob 307 mounts.

Also is there any difference in the transmissions i dont know the ways to identify them but i have 4 of them 2 short shaft and 2 long shaft. i was wondering if there was any way to tell what they came out of. I pulled 1 short shaft out of a 77 caddy with 425 i think it was the original. 1 of the long shafts is out of a 74 88 but i doubt that is what it is for (it has junkyard writing). I was planning on using the short shaft out of the caddy cause i know its good.
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Old 09-22-2010, 09:03 PM   #2
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Default Re: th 400 in a g body

its quite a bit of work, considering you could just get a beefed up th350 and put it right in if u had a th200 and if you had r4, i think just the th200 crossmember is all you need to put th350 in it...maybe a drive shaft fr0m a th-200 car also? help me guys. i do know 350 is direct replacement for th200,ive done it
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Old 09-22-2010, 09:49 PM   #3
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Default Re: th 400 in a g body

The 455 will bolt in pretty easy. To keep your A/C you will need to use all the brackets and pulleys off the the 307 and you will need to use the water pump for the 307.

The transmission will bolt in if you use the crossmember for 200R4.
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Old 09-23-2010, 04:38 AM   #4
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Default Re: th 400 in a g body

If you need a driveshaft let me know. I bought one a few years back from someone who put less than 1k miles on it and ended up selling my project. Still just collecting dust in the garage

It's for a long-tail TH400 to 7.5" rear, I could get a true measurement if you need it.
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Old 09-23-2010, 11:22 AM   #5
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Default Re: th 400 in a g body

If you have a short tail th400 its not that bad of a swap at all. Ths speedo cable is the same, the crossmember is the same as a 2004R, the driveshaft shouldnt need to be modified just have the large yoke put on. The kick down switch is easy to hook up all cars have the spot for it, and the only big pain is bending the cooling lines to fit right. O and you need a vacume line.
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Old 09-23-2010, 02:05 PM   #6
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Default Re: th 400 in a g body

Quote:
Originally Posted by sleepin cruiser View Post
If you have a short tail th400 its not that bad of a swap at all. Ths speedo cable is the same, the crossmember is the same as a 2004R, the driveshaft shouldnt need to be modified just have the large yoke put on. The kick down switch is easy to hook up all cars have the spot for it, and the only big pain is bending the cooling lines to fit right. O and you need a vacume line.
Even a short tail TH400 is about an inch longer than a 200-4R. Using the stock driveshaft runs the risk of bottoming the yoke and damaging either the trans or the rear end.
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Old 09-23-2010, 05:33 PM   #7
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Default Re: th 400 in a g body

Quote:
Originally Posted by sleepin cruiser View Post
If you have a short tail th400 its not that bad of a swap at all. Ths speedo cable is the same, the crossmember is the same as a 2004R, the driveshaft shouldnt need to be modified just have the large yoke put on. The kick down switch is easy to hook up all cars have the spot for it, and the only big pain is bending the cooling lines to fit right. O and you need a vacume line.
Thanks for the info. Just wanted to make sure i didnt have to switch the speedo cable. I got some steel and a welder i was gonna build a crossmember cause i dont have any extra 2004r ones laying around. Do they make different plastic gears for making the speedo correct?

The drive shaft its prob gonna be trailer it to the driveline shop and say make one.

Evan as far as the trans this car its gonna be for fun not racing and i have the th400 dont have any extra th350 or 2004r. Im just gonna bolt it to a stock 455 and go just to get the parts out of the garage.
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