Help! What's wrong with my trans or diff? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Transmission Mods

Transmission Mods Performance Transmission Modifications

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  #1  
Old 01-12-2019, 04:27 PM
Sumdumguy Sumdumguy is offline
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Join Date: Jan 2019
Posts: 2
Help! What's wrong with my trans or diff?

Hello,

I have a 2007 Trailblazer 4x4 that I use to pull a trailer. I am having an issue with the transmission or differential.

I was driving home on the freeway a few days ago, when my RPM gauge went through the roof like it was in neutral. I coasted to a gas station, checked the gears and reverse. Nothing.

Just before I was going to call for a tow, I tried the 4WD. Voila! It drives with the front wheels no problem. Drove it home with no issues.

Proceeded to drive it with the trailer for a few more days, maybe 120 miles. Ran perfect, kept it under 55 and had no problems.

Today I had some time to check it out. Switched it into 2WD and it ran fine, drove it all over town. After it had warmed up a bit, it started slipping like a clutch. Stopped, put it in 4WD, no problems. Drove it around in 4WD no issues, no slippage, nothing.

I'm thinking and hoping differential, but I don't know.

If anyone has seen this and could help me find the solution, that would be fantastic!

Thanks.
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  #2  
Old 01-14-2019, 07:07 PM
miketexas miketexas is offline
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2003 Chevy TrailBlazer LS
Black 4.2L I6 2WD
Join Date: Feb 2018
Location: TX
Posts: 359
Quote:
Originally Posted by Sumdumguy View Post
Hello,

I have a 2007 Trailblazer 4x4 that I use to pull a trailer. I am having an issue with the transmission or differential.

I was driving home on the freeway a few days ago, when my RPM gauge went through the roof like it was in neutral. I coasted to a gas station, checked the gears and reverse. Nothing.

Just before I was going to call for a tow, I tried the 4WD. Voila! It drives with the front wheels no problem. Drove it home with no issues.

Proceeded to drive it with the trailer for a few more days, maybe 120 miles. Ran perfect, kept it under 55 and had no problems.

Today I had some time to check it out. Switched it into 2WD and it ran fine, drove it all over town. After it had warmed up a bit, it started slipping like a clutch. Stopped, put it in 4WD, no problems. Drove it around in 4WD no issues, no slippage, nothing.

I'm thinking and hoping differential, but I don't know.

If anyone has seen this and could help me find the solution, that would be fantastic!

Thanks.
When it wont go, does the speedometer indicate that you are moving? And when you put it in park do you hear a horrible ratcheting sound? if so it's the differential. If not something else.
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Old 01-14-2019, 07:22 PM
Sumdumguy Sumdumguy is offline
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Join Date: Jan 2019
Posts: 2
Haha, I meant to say transfer case not differential...

It does make a nasty ratcheting noise when you put it in park, only in 2wd.

I don't know about the speedometer. I'll take it out in the morning in 2wd and drive it until it stops driving and see.

I'll report back then.

Thank you for the reply.
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