air leak when i first touch the gas

[performancered]

I just had my tranny rebuit in my brothers 93 atx sho. Now it makes a sound which sounds kind of like an air leak when you first touch the gas. It also revs way up while bairly accelerating if you floor it around 50-60 then it slamms into gear. It shifts kind of hard when driving slow in the city as well from 2nd to 3rd gear which i hear can be an issue mainly if you let off quickly on the gas. The cruise works fine. any ideas I thought my mechanic said something about a code for speed sensor when we bought it but i don't think it came up again after he cleared the codes.

thanks

 

[Slo-Sho]

Those symptoms are not normal, if you just had it rebuilt, it should still be under warranty. Take it back.

 

[rangerj]

Performancered,

If your automatic trans was just rebuilt, and it allows the engine to rev and then kicks in, you have one or more serious problems inside the trans. Get back to the shop that did the work and get them to fix it right.

Just a couple of possibilities;
One or both bands are not adjusted right, or the valve that applies pressure to one or both bands is sticking in the bore, then pops free and the trans bangs into gear;

A piston in a clutch pack is sticking in the bore and not applying pressure to the clutches, you rev up and increase hydrolic pressure and the trans bangs into gear. Maybe a spring was put into the trans the wrong way round, especially in a clutch pack.

The springs were put in the wrong position in the valve body (if they took it apart to clean it!), or one or more check balls got left out.

These are just a couple of possibilities based on the limited information you provided. The explanations are overly simplistic and in less than the best technical terms.

The real point hear is that if you paid for a rebuild, you did not get the job done right. The shop that took your money has an obligation to make it right, if you are still in the warranty period.

If you got the trans rebuilt 6 months ago and spent the summer on the NHRA circuit, well that is another story! rangerj

 

[performancered]

My father brought the car back to the shop and they claimed they drove it around for hours and it neaver acted up. It sometimes shifts hard or almost out of sync out of 2nd into third and espicall around 45-50 if you floor it is when it revs up and slips. When I drove it back home I tried shifting it manually which before i got it rebuilt was the only way for it not to slip even floored except o/d. Now it shifts hard out of every gear when you do that. Where as it now shifts smooth when in auto when driven hard in the city. but like i said flooring it when its in od causes it to slip if done around 50mph. however it seems to slip less if at all after it has been driven for a while.