Just replace the rear end on my burb and now my Trans is acting up worked fine befor replace....will not start off in drive or 3 1 &2 it will and if I shift from 1 up it will shift through all gears but if I get on it in first it slips reverse works just fine plz help thanks


99 Chevy suburban ls k1500 4x4 5.7

 

Greetings Lucas, welcome to the Forum.

It may not be related to the problem, but...
Are you sure that the Ratio of new Differential, is the same as the original ?

 

Yes im sure its a gt4 3.73

 

Good...

Your situation is really strange. There's no "mechanical" reason why that shouldn't have worked. The only thing left would be the Wheel Speed Sensors. Did you keep/use the ones on the new differential, or put your original ones on the Axel ?

You might check them...
How to Test a Wheel Speed Sensor | eHow.com

 

It dont have any sensors back there and I checked all my fuses.....what are some common Trans problems thst it would mak it do that

 

Lucas,

I'm going to need a little more information...

1) Please give me your VIN Number, and...

In your Glove Box, there should be a Tag/Sticker with several three Letter/Number sets on it. Those are RPO Codes, which reference the original equipment which was installed on your vehicle.

2) Do you see any of those codes, which start with the letter "J" ?
If so, tell me what those codes are.

3) Now, tell me why you had to replace your rear end, and...

4) I want you to check your Motor Mounts, to see if any are broken/loose. (do you know how to do that ?)

 

Motor mounts are fine replaced the rear end cuz it busted theres was a clunking coming from it for months just never did anything about it.....I think it might be the shift solenoids

 

I'm not sure since I can't check your VIN or RPO's, but I think it's because you don't have any information from the rear wheel sensors to the computer. You do have ABS, don't you ?