200r4 question?

[BIGBLU 72]

first thing im wondering is will i have to move the trans cross member if i go from a th400 to 200r4?
second i think i found a good deal on a core to rebuild...$75. is that a pretty good deal?
third what the heck is a "unibolt" 200r4?

[69lemans]

Crossmember will need to be moved back,but there should already be holes in the frame.
Thats probably a fair price for a core.
Unibolt means it has both bolt patterns for Chevrolet and for Buick Olds Pontiac

[cdowns]

its 200 4r tranny that you need

[BIGBLU 72]

okay good! i think the guy said it was out of a V8 85 monte carol so will that have the gear driven speedo?

[raycow]

Leave your crossmember in the TH400 position. The distance from the bellhousing face to the mount is the same on both transmissions.

I have never heard the term "unibolt" before, but all the 200-4Rs I have seen had a dual-pattern bellhousing which would fit both Chevy and BOP. That is probably what "unibolt" means.

Ray

[ewoody625]

i heard that the 200 and 700 r4 will bolt right in with no mods if you have a 400 trans

[cdowns]

you'll need driveshaft done as the th400 tranny has a different type of yoke

[BIGBLU 72]

i just talked to the guy about the trans and im getting it for 50 bucks! the said it was behind a 87 monte carlo with a 4.3 v6 is that goin to be a problem? im goin to have it rebuilt to a pretty stout trans but the core only has 95k miles on it so im thinking that it might be in decent shape.

[raycow]

Originally Posted by ewoody625

i heard that the 200 and 700 r4 will bolt right in with no mods if you have a 400 trans

The 400 is about an inch longer than the 200-4R, and as already mentioned, has a larger output shaft spline. The 700 is about 3" longer than the 200 and its mount is closer to the front.

Ray

[68GMCCustom]

Just be sure its a 200-4r...and not a TH-200 or TH-250!

1968–1986 TH350/TH350C/TH375B/TH250/TH250C
1976–1987 TH200/TH200C
1981–1990 TH200-4R
1982–1993 TH700R4/4L60


My 200-4r:

[BIGBLU 72]

okay so what am i going to have to do to this trans to make it live behind a 400hp-425hp 400sbc?

[68GMCCustom]

mines built for 500hp or so...

[cdowns]

Originally Posted by BIGBLU 72

okay so what am i going to have to do to this trans to make it live behind a 400hp-425hp 400sbc?

www.fbperformance.com they've been racin these for many many years over 1000hp not an unusual build for them

[mrh33916]

Coming off of a V6 you will probably have to change both the drive and driven speedo gears. Have the builder install the correct ones for your application when he builds it as the drive gear on this tranny is a part of the governor.

[68GMCCustom]

Art Carr move to CA...but he's one of the best with 200-4R's.

http://www.cpttransmission.com/index.htm

[rsavage]

Lots of info on Bowtie Overdrives too along with the Buick Grand National site. Best trans came from the GN's (virtually impossible to find) and the Monte SS's. Both had valve bodies that would shift at 5000 rpms under wot. The rest (Cadalacs, Chevy's Olds, etc.) shift at 3000 rpms wot. Mine was from an 84 V8 olds and it shifts exactly like Grandpa's olds, way too smooth and way too soft. When I change engines, I will have to do some work on the transmission too. Right now with the original 307, it doesn't much matter. TV cable adjustment is critical to the 200 4R's longevity. You will need a bracket that permits the proper adjustment. Several tranny builders such as Bowtie OD's make them for specific carbs. Keep us posted on what you learn.

[BIGBLU 72]

im goin to build this trans to pull trailers and stuff. its not goin to be a hot rod truck. would i do better to just find a 700r4 ans build it or just stick with the 2004r

[68GMCCustom]

check our the ratios and see which will work best for you. I like the closer 1-2 and lower 4th ratio of the 200-4r