In the past month, I've had an intermittent issue engaging reverse on my '93 SSE from a cold start. It shifts just fine but the transmission won't engage until I either gently give it some gas (results in a bad sounding clunk but I start rolling) or let the engine warm up about 15 - 30 seconds and then shift into reverse. Otherwise, it shifts perfectly fine once out on the road and more often than not, it shifts into reverse normally from cold starts, too. The fluid level is perfect (dead center in the dipstick safe area). The car has 145K and I had the transmission flushed about 10 years ago. Judging from other posts, it seems like it might be a low pressure problem from a dirty filter or similar. Can anyone suggest some stuff to check? I'm hoping it's something simple (and cheap). Thanks!

Try running some Lucas trans fix in it. I swear by that stuff and its only like $8-10 a bottle and I dont think you have to drain any out either. Im pretty sure you can just add it to whats in there otherwise you may want to try changning the filter and fluid

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Clay
1997.2 40th SLE-138k
1968 Bonneville 400ci w/TH-400-40k
1999 GMC Suburban SLT-191k
2005 Escalade 253k-GINA

Have you ever replaced the modulator? When you switch to reverse, it is supposed to go to full line pressure. Normally they fail and cause a slam into reverse. hey are fairly cheap and easy to replace.

You can test the vacuum modulator by removing it (easy, one vacuum line, and one bolt), and hold it so the vacuum port is pointing down. If fluid comes out the vacuum port, the diaphragm is bad. If fluid doesn't come out, the modulator isn't necessarily good, though. They are cheap to replace ($15 or so) and are usually adjustable.

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

Thanks for the tips. I was wondering about the moulator - I'll have to check it out.