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Hi guys new to the forum and having a problem. I have a 1999 hugger orange ss auto car with 55k miles. When I come from a light at low throttle it goes to alto higher rpm then normal to shift. It shifts fine it don’t bang or jerk but at wot it hits the limiter and won’t shift till I let off the throttle. After 1st all gears besides first shift fine at light throttle but at wot hits the limiter like 1st. I’m kinda stumped. Fluid is good not burnt and full only mods are headers y pipe and exhaust lid and smooth elbow. Any help would be great. Thanks.
guys new to the forum and having a problem. I have a 1999 hugger orange ss auto car with 55k miles. When I come from a light at low throttle it goes to alto higher rpm then normal to shift. It shifts fine it don’t bang or jerk but at wot it hits the limiter and won’t shift till I let off the throttle. After 1st all gears besides first shift fine at light throttle but at wot hits the limiter like 1st. I’m kinda stumped. Fluid is good not burnt and full only mods are headers y pipe and exhaust lid and smooth elbow. Any help would be great. Thanks. I have tried replacing the maf and tps with no change.
You *most likely* have burned the band. Your transmission is a compromised design in that it needs a band to apply for 2nd & 4th gear. Under light throttle you say it will hold.. But under heavy throttle it won't upshift. Welp, it's TRYING to upshift but the band can't stop the Reverse Input drum from spinning which has to happen for 2nd gear to become active.
You can test this theory.. Get up under the car with it safely supported and then using some type of lever, or pry bar, force the large round cover over the 2/4 servo inward. If it moves MORE THAN 1/8", the band is FINISHED. As the band wears, or is burned, the clearance will open up and the cover will travel a longer distance inward. The more travel you have, the worse off the band is.
Of course this is just one theory as there are many things that can cause your symptoms. From a distance though, that is where I would place my $$ if we were betting.
Actually 1/8" is barely outside the spec of .075 - .120. From reports here, end play more than 3/16 is when the band begins to slip.
As Kawabuggy suggest, estimate the end play by holding a ruler near the servo cover and press on it with a crowbar. I'll bet its close to 1/4".
Another good way to measure band clearance but takes two people is with a digital caliper. Use the depth finder side and put the end on case like in the picture below and the tip on the servo cover. Then push the servo in and have someone take a measurement the same way. Subtract the two numbers and you have your exact clearance.
I do the same thing as above, but use a long rubber tip woodworking clamp near the cutout for the shift linkage and use it to draw in the servo and hold it in place. Makes it easy to get an accurate repeatable reading.
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