Jump to content

Cost for re-gearing? 3.08 to 3.42


Gasser43

Recommended Posts

Hey guys,

 

    Couple months ago I purchased a Silverado z71 crew cab 4x4.  It was a 2015 used and when checking vin lookups as the window sticker was not available, they said 3.42 gearing. Now I've asked the dealer to email me an RPO for the truck and it shows 3.08!!  I'm really bummed as I bought it thinking it was 3.42 gears which puts the towing capacity at 9200 vs 6400 lbs.  I'm wanting to tow a travel trailer about 7000 lbs.  Anyone know how much it would be to replace the front and rear to 3.42 gearing?

 

Thank you for your time!

 

 

Link to comment
Share on other sites

I tried crawling under it and looked all over with no luck to find the  ratio stamped on the rear diff.  Also, I found in the glove box the gearing code that does state it is 3.08 unfortunately.  Really let down with GM selling a 1/2 ton 4x4 with a hitch AND an electronic brake controller with 3.08 gears.

Link to comment
Share on other sites

I did this to an S-10 back in 83 - by the time I was finished with the rear only (it was 2WD) I had just over $500.00 into it. A lot depends on how much you need to change - I did not have to change anything other than the ring and pinion gears plus all the seals and bearings in the rear end. My dealer also misrepresented the towing capacity of my truck - he quoted me the 3.73 rear gear towing - not the 3.08 - this was my learning lesson on tow ratings.

Back then I also had to change the speedometer drive gear in the transmission. Today you would need to have the control module re-flashed.  I would also shop around- I got the best deal at a GMC dealer for both parts and labor.

Link to comment
Share on other sites

10 hours ago, Gasser43 said:

Thanks guys, I'll check on the axle tube for a code and ask the dealer to verify this.  

If you cant find out what the gearing is jack both rear wheels off the ground mark the driveshaft turn the rear wheel by hand 1 complete turn and count how many times the driveshaft spins, if it spins 3 times then its a 3.08, spins almost 3.5 times then its a 3.42, spins 3.75 times then its a 3.73 and so on. 

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.