metric 200 chevy bolt pattern

Dan Fahey · 03-01-2018, 11:00 AM

Quote:

Originally Posted by ss3011

Basically a 200-4R is a 200THM with an overdrive gearset added in front of the 3spd guts . The 4L60-E is based on a 700-R4 which makes the 4 speeds using only 2 planetary gearsets , then adding an electronically controlled valvebody . The most common 4L60-E , has a Chevy bell , but there also is a smaller bell available to hook up to a 3800 V6 .
The 200-4R had two bellhousings available , a composite BOP/Chevy bell and a BOP only bell . All 200-4R's were old school with a governor controlled hydraulic VB .

Thank you..
My car uses the 4L60E and can make changes via TunerCat.
Really like the 3.08 first gear to get my heavy car launched.

What kinds of modifications are done to these transmissions to reduce drag yet keep reliability?

D

ss3011 · 03-01-2018, 03:01 PM

Using an overdrive automatic , has a lot to do if you use 4th gear . If you don't , then it makes more sense to run a 3 speed and take advantage of lower weight , and less rotational inertia .

Dan Fahey · 03-02-2018, 01:26 PM

Quote:

Originally Posted by ss3011

Using an overdrive automatic , has a lot to do if you use 4th gear . If you don't , then it makes more sense to run a 3 speed and take advantage of lower weight , and less rotational inertia .

Anyone using OD in the 4L60E?

D

ss3011 · 03-02-2018, 06:03 PM

Way back in the mid 80's when Oldsmobile was out there racing a lot of 307 Cutlass's , the Stockers were running with a 350THM . I was able to get them to give me one so we could develop a 200-4R to race . To use 4th gear, I was running a 5.57 rear gear , most had about a 5.13 . At the time there was no support for the 200/200-4R so converters were a problem . Also a .67 ratio , 4th gear , dragged the engine down too far . The problem was fixed by swapping in a .72 ratio overdrive from a transmission that GM built for BMW . Now there is great support for a 200 , so converters , and lightweight internals are readily available .

03-01-2018, 03:01 PM	#2
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: metric 200 chevy bolt pattern Using an overdrive automatic , has a lot to do if you use 4th gear . If you don't , then it makes more sense to run a 3 speed and take advantage of lower weight , and less rotational inertia .

03-02-2018, 06:03 PM	#4
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: metric 200 chevy bolt pattern Way back in the mid 80's when Oldsmobile was out there racing a lot of 307 Cutlass's , the Stockers were running with a 350THM . I was able to get them to give me one so we could develop a 200-4R to race . To use 4th gear, I was running a 5.57 rear gear , most had about a 5.13 . At the time there was no support for the 200/200-4R so converters were a problem . Also a .67 ratio , 4th gear , dragged the engine down too far . The problem was fixed by swapping in a .72 ratio overdrive from a transmission that GM built for BMW . Now there is great support for a 200 , so converters , and lightweight internals are readily available .