1988 supra transmission problems

mrnickleye · 03-20-2007, 01:27 AM

In 'L' it will stay in 1st gear.
In '2' it will start out in 1st gear, then up shift normally to 2nd gear, and then stay in it (unless you stop, or slow down, or floor it, then it will go back down to first gear).

dave in indy · 03-20-2007, 02:16 AM

If you let off at 30 m.p.h. you probably will get a hard downshift as the gearing is so low. For instance you take off faster in Low is because of the gear ratio is changed, this in turn causes the engine to slow down faster causing the hard and quick redline. This is normal. If you're accelerating and it down shifts you got a rebuild problem. Low gear is not really designed to go above 15 m.p.h. on an automatic. I do transmission testing (dyno and bench) for GM on the upcoming 2008 Tahoe Hybrid so I've got a lot of time on Automatics.

03-20-2007, 01:27 AM	#1
mrnickleye 1000whp postwhore Join Date: Jun 2005 Location: Mojave Desert, Calif. Posts: 1,705	In 'L' it will stay in 1st gear. In '2' it will start out in 1st gear, then up shift normally to 2nd gear, and then stay in it (unless you stop, or slow down, or floor it, then it will go back down to first gear). __________________ Had a Red 1989 N/A. Automatic. Sports Pkg. w/wing. TEMS, and some nice MODS. Sold to a friend 10/08/08.

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03-20-2007, 02:16 AM	#2
dave in indy Stock Join Date: Mar 2007 Location: indiana Posts: 4	If you let off at 30 m.p.h. you probably will get a hard downshift as the gearing is so low. For instance you take off faster in Low is because of the gear ratio is changed, this in turn causes the engine to slow down faster causing the hard and quick redline. This is normal. If you're accelerating and it down shifts you got a rebuild problem. Low gear is not really designed to go above 15 m.p.h. on an automatic. I do transmission testing (dyno and bench) for GM on the upcoming 2008 Tahoe Hybrid so I've got a lot of time on Automatics.