Visit The Dirt Forum for More Information

Author Topic:   Transmission Swap
Dirt Maniac

Total posts: 111
posted September 19, 2004 03:29 PM  
My 86 Monte Carlo LS came with the THM-200-4R and I have a THM-350 I want to put in. The THM-350 came out of a 76 GMC 2wd 1/2 ton truck. What will I have to do to make this transmission work in my car as far as mounts and everything else??


Dirt Forum Champ
Total posts: 5390
posted September 19, 2004 04:56 PM  
Ok, the tail on it now is approximately 10 inches, I assume thats a long?? Also what kinda shifter should I use, I hear of people just using a basic metal piece but I want something that I cant bump accidently and throw it into 1st or something. Thanks for the help, I am new at all of this.

Dirt Forum Champ
Total posts: 5390
posted September 19, 2004 08:45 PM  
if it is a short shaft they fit right in
and you can make a shifter for about $2.00

drive hard or drive home

Dirt Maniac

Total posts: 111
posted September 20, 2004 05:38 AM  

How hard is it to make it a short shaft? I see like 4 bolts on the rear? Will do a search for shifters....Thanks again!

Dirt Freak

Total posts: 374
posted September 20, 2004 07:25 AM  
It would require a complete teardownand replacement of the output shaft, and housing. Find another tranny.

[This message has been edited by powerglides (edited September 20, 2004).]

Dirt Maniac

Total posts: 111
posted September 20, 2004 08:07 AM  
If the mounts and everything will be the same I will just make another drive shaft. Is there a disadvantage to a long tailshaft?

Dirt Freak

Total posts: 369
posted September 20, 2004 09:59 AM  
yea short shaft t350's are usually easier to find so don't cut down your drive shaft
find a new trans

drive hard or drive home

Dirt Roller

Total posts: 14
posted September 21, 2004 06:15 PM  
Look at the shifters that Performance Bodies sells. They are aluminum. It was about $60 I think. I am very happy with mine. It comes with allen bolts that you can put wherever you want so if you hit the shifter by accident, the shifter will hit the bolt head and your tranny will not come out of gear.

Dirt Maniac

Total posts: 123
posted September 23, 2004 03:33 PM  
I made a pretty slick shifter out of rebar from the suggestions a few guys made, thanks for the help. Just made a few links and a pivot off of the cage. It cost me a couple bucks worth of material and a few hours.

Dirt Maniac

Total posts: 174
posted September 24, 2004 11:46 PM  
I use floor shifters out of cameros or olds.By using a cable shifter if the trans moves around it will not jump out of gear.

bfx racing
Dirt Full Roller

Total posts: 42
posted October 15, 2004 10:39 PM  
when I built my car this year , I had spare factory parts in a shed...
I used the rear trunk lid springs for the shifter rod...
use a torch to heat it up where you need to bend

If it aint got a's not a sport

Back to the Archives