Allison Transmission upgrades

A Facebook user
55

Asked by Joshua1220 May 28, 2008 at 09:03 PM about the 2003 GMC Sierra 2500HD

Question type: Car Customization

I was about to upgrade my whole transmission... because my torque converter is slipping into 1st and into 5th.... but has anyone ever done an upgrade? Who with? What brand? and did it help?

4 Answers

littlehorn
32,155

I would contact a mechanic you trust, they should have some suggestions of what they have done.

A Facebook user
55

That's the problem... I don't trust anyone here... that's why I"m asking here

Joey Cucura
25

if your transmission is slipping then it may need a service. Any triple disc billet torque converter would be a good choice for a slightly modified engine. if you have over 500hp then you probably want a 5 disc torque converter. new valve body and a shift kit could also help your transmission out. companies like ATS and BD make strong reliable torque converters. they also make super strong fully rebuilt transmissions.

Chuck Sydlo
75

I have had to replace the shifter switch at the transmission once and I know a friend that had to replace his as well, so I would replace it first. I lost 5th gear altogether and had erratic shifting in other gears. The trans is electricly controlled so any failure of that switch can cause all kinds of weirdness. It seems that the switch is the weak link in the Allison.

3 out of 3 people think this is helpful.
You think this is helpful.

Your Answer

Add photo

Related Questions

  • towing 8 answers

    Have a 2001 2500hd crew cab - short bed 6000 v8 4.10 axle ratio. 5th wheel hitch - want to upgrade my horse trailer ..Looking at gooseneck horse trailer (living quarters) 3 horse slant - empty we...

    2001 GMC Sierra 2500HD 4 Dr SL 4WD Crew Cab SB HD

    -

    General

  • 2004 Yukon Denali Navigation Upgrade 3 answers

    Hello All - I have a 2004 Denali that I would like to upgrade to the latest touch screen nav unit. Is it possible? How much and where can I get it. Is it plug and play? Any info would be greatly a...

    2004 GMC Yukon Denali 4WD

    -

    Car Customization

  • What options do I have for radio upgrade? 2 answers

    I have a 1988 GMC Sierra C1500 and the original radio (a Delco Model # 16071015) has buttons that no longer work, I can't adjust volume, change stations easily. Is there a product out there I could ...

    1988 GMC Sierra 1500 C1500 Standard Cab SB

    -

    Car Customization

  • What type of performance upgrades help the 6.2 other than exhaust and air intake upgrades? 3 answers

    2008 GMC Yukon Denali AWD

    -

    Car Customization

  • Looking for input on a V8 swap, stock heads or Vortec? 6 answers

    Hi, I own a 91 GMC Sierra 4WD Standard Cab Stepside with a 4.3 litre V6 and 5 speed transmission. I've put a lot of work into her already, as I do bodywork for a living. I plan on doing a V8 swap this...

    1991 GMC Sierra 1500 K1500 4WD Standard Cab Stepside SB

    -

    Car Customization

Sierra 2500HD
Looking for a Used Sierra 2500HD in your area?
CarGurus has 11,832 nationwide Sierra 2500HD listings starting at $4,495.
ZIP:

Search GMC Sierra 2500HD Questions

GMC Sierra 2500HD Experts

#1 iEATricers
iEATricers
Reputation 80
#1 BoholMark
BoholMark
Reputation 80
#1 Markguidry856
Markguidry856
Reputation 80
View All

Related Models For Sale

Used Chevrolet Silverado 2500HD"
335 Great Deals out of 28,909 listings starting at $350
Used Ford F-250 Super Duty"
425 Great Deals out of 36,722 listings starting at $3,495
Used GMC Sierra 1500"
692 Great Deals out of 59,664 listings starting at $2,000
Used Dodge Ram Pickup 2500"
186 Great Deals out of 4,773 listings starting at $2,395
Used Chevrolet Silverado 1500"
1,636 Great Deals out of 133,605 listings starting at $999
Used Ford F-350 Super Duty"
389 Great Deals out of 23,931 listings starting at $3,500
Used GMC Sierra 2500"
168 listings starting at $5,900
Used Ford F-150"
2,103 Great Deals out of 121,851 listings starting at $988
Used GMC Sierra 1500HD"
3 Great Deals out of 110 listings starting at $4,980
Used Chevrolet Silverado 2500"
8 Great Deals out of 260 listings starting at $5,000
Used Toyota Tundra"
446 Great Deals out of 16,347 listings starting at $2,900

Used Cars For Sale

2015 GMC Sierra 2500HD For Sale
4 Great Deals out of 8,414 listings starting at $30,988
2014 GMC Sierra 2500HD For Sale
4 Great Deals out of 324 listings starting at $26,707
2013 GMC Sierra 2500HD For Sale
26 Great Deals out of 627 listings starting at $19,995
2012 GMC Sierra 2500HD For Sale
6 Great Deals out of 396 listings starting at $16,500
2011 GMC Sierra 2500HD For Sale
13 Great Deals out of 461 listings starting at $15,950