200 r-4 slips out of gear when I floor it

[85GPLef41]

If adjusting the cable one or two clicks forward or backwards doesn't fix the shift points, most likely the trans is going to need a rebuild. As for a performance rebuild i would look at http://www.cpttransmission.com/. They seem to know whats needed to make the 200r4 survive high power applications. Hopefully this helps with some ideas on your rebuild.

 

[waggin]

Drove over an hour to find that the '85 Cutlass Supreme w/overdrive was (I believe) a TH200 w/lockup converter. Owner thought the locking up & unlocking was shifting in & out of OD. Odd configuration though. The car has the sport guages and a rear swaybar. Finding the non-OD was a surprise. Thought all '85 Cutlass cars w/V8's were 307/TH200R4 equipped. Not buying it for that & other reasons.

 

[85GPLef41]

Oh ok my car originally had that same trans mated to the 305. It also had rally gauges, H.D. suspensions and other nice options. The rear originally was a 2.48 ratio i think...