So, 700r4 with a tight converter. In the days of racing we used to mix ATF with Tractor Hydraulic Fluid - this was in either the 350TH or 400TH. We could basically change to flash converter stall. Has anyone done this with a 700r4? I know the GN guys use different levels of fluid (200r4) for drag vs street. The converter in the car is very tight - has anyone used the lighter fluid in a 700r4? If yes, what viscosity have you used. Thanks, byron

 

ATF is 7 - 7.5 weight. The hydraulic oil (tractor oil) has been used many times in 700R4's over the last 20+ years. 40% to 100% depending on the type of racing or the use of the transmission.

 

I used tractor fluid in my th400 and it tightened the stall up. Not alot but some

 

Some people with the TTA with 200R4 use the tractor fluid and have great results.

 

I run 60% tractor fluid 40% Mobile 1 ATF in my 700R4 maybe 100-150 rpm tops less stall on the converter. But trans runs cooler and rear planets get better lube after 20 min at Gingerman raceway trans is about 230-240

 

Thanks to all. Car came out of the Dyno shop last week. Final tune this weekend - then I am driving to Omaha on Wednesday of next week. Looking forward to the drive (430 miles).
Thanks - byron