Turbo 250 or 350

[Mark Yacavone]

Originally Posted by Alan Roehrich

A 350 (as well as a 400) uses a different pump drive hub, a different stator shaft spline, and a different input shaft spline from the 200 Metric. Some of the 200 builders modify the pump and forward input drum in the 200 to match the 350. If I were buying a 200, I would certainly want it done that way.

Let me add: The main difference is total stack up height of the 200/2004R/700R4 converter, which is about .300 shorter than a a 350/400.
The stator shaft spline is actually the same on all of them,..even the 125/440 FWD trans.

Now ,seeing I don't build transmissions for a living ,I'll assume I can post this here.

200 durability issues:

When we built the trans for Tibor's L/SA Firebird (which is now for sale),we decided to go with the 200, already having done the research on my Omega.
I built the first one , using a Turbo Action valve body and a Sonnax billet servo, and no lightened or heavy duty stuff. That trans was in the car all of 2006 when Tibor won enough rounds to tie for first place in the world points.
After that season, I did an inspection and found the factory writing still on the direct clutch frictions. The factory replacement narrow band was still like new also.
I built a second trans for a spare for the 07 All Star race. That unit now has a Leo (REMAC ) 2.91 low gear planetary and a wide Kevlar band ,just for insurance.
All in all ,we've had great dependability with both units. One of them started to roll a low sprag one time, but we caught it in time.
The Firebird is now in the 11.70 range @ 3600 lbs ,and still no problems.

Just some real world experience. No conjecture here. Carry on...

[Alan Roehrich]

Mark, you are indeed correct on the stator spline, I checked my notes, and was going to correct my post, but you beat me to it.