hey guys i wanted to go th400 and wanted to know what i would need to modify in order ot make it work on my car, does anyone make a boltin crossmember for the th400? also who is a well known reputable builder of these trannies or can i go with just an off the shelf TCI superstreetfighter trannies which are capable of 800hp i wanted ot go with reverse manual valve body and with a transbrake.


what is needed in order to make our stock driveshafts work with the th400 i figure it would be longer but will i need a different slip yoke?

any help would be greatly apprecaited.

 

I believe BMR makes a bolt-in TH400 crossmember.

What are your plans for the car? Are you sure you want to give up your overdrive? CPT could build your 4L60E to withstand 800+hp, and it would probably cost you less than that TCI would.

 

yeah but theres no brake on CPT's 4l60e thats why

 

Can we assume you are asking about one of your B-Bodys?

The TH400 requires a TH400 slip-yoke.

 

thats cool is there a place i can get one from a part number or something.

and yes for one of my b-bodys the roadmaster.

 

Any driveshaft shop can get you a TH400 slip yoke. Here's the one I have:

http://www.markwilliams.com/detail.aspx?ID=295



I have a "slightly used" (less than a dozen passes) Mark Williams 3" chrome moly DS with that yoke, and a solid 1350 diff-end yoke. I only removed it because I needed a much shorter one when I added the Gear Vendor unit. If you are interested, and you can figure the length you need, let me know (via PM or e-mail), and I will check to see if it matches the length of the one I have available.

 

thanks for the info Injuneer but i wish the DS would work for my application but i think the f-bodys shaft is like 2' short of what i need. now i have to come up on a slip yoke..i hope it uses the same 1350 joints that are on my stock shaft.

 

Not trying to be a wiseass, but if you need a TH400, you need something better than a stock driveshaft.

Rich

 

i wouldnt see why my bud running mid 10's in his b-body is running a stock shaft but w/e.

 

All he is saying is why put a marginal DS in when if you really need a TH400 then you really need a decent DS.
I have a TH400 and a Strange 12 bolt. Connecting the 2 is a Dennys Nitrous ready DS. If you have never expierenced a DS failure at speed then trust me when I say you don't ever want too.
I am a cheap bastard but I learned the hard way that the driveline is not the place to cheap out.

 

i will be making a custom Alum DS regardless as it is a better price for me then just making a regular steel one.

 

Get a steel DS. An Al shaft has no place on a drag car (which is what I assume you are building).

Rich

 

I thought carbon fiber was the hot setup... and the 3.8" HD ACPT CF DS I bought failed. Now I use chrome moly. Buddy of mine with a blown 383 twisted an LPE 3.5" aluminum DS into a pretzel at less than 750 flywheel HP. He switched to chrome moly.

w/e

 

any serious racer is going to have steel. Its the only dependable/safe option IMO.

I don't think b-bodies come with 1350 joints (maybe a 1 ton truck) they probly have a 1310.

you can get a good slip yoke from a truck driveline shop, they are made by strange engineering. about $170 or more. with 1350 joints.

Not sure why anyone who "needs" a 400 would consider an of the shelf el cheapo converter or a POS TCI trans. They make good parts but the units are turds.

Frank at CPT may be willing to build you a 400, You could buy one from Rossler or coan or someone depending on what you need.

BTW you have a few people looking for you in the seller feedback claiming they have been scammed, just a heads up