Advice needed on driving a truck with a 2 speed rear axle - Diesel Place : Chevrolet and GMC Diesel Truck Forums
Home Forum Market Place Garage Lounge (1) Tuning Library DTC Tool Register Vendors
Go Back   Diesel Place : Chevrolet and GMC Diesel Truck Forums > Speciality Forums > Drivetrain - 2001 - 2010
Register FAQ Forum Rules My Replies My Threads Mark Forums Read Auto EscrowAuto LoansInsurance Chat Room

Drivetrain - 2001 - 2010 Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. First through fourth generation... is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
LinkBack Thread Tools
Old 01-22-2011, 07:57 AM   #1 (permalink)
Diesel Apprentice
hzl6cm's Avatar
Join Date: Jan 2010
Location: Odessa, MO
Posts: 398
iTrader Score: 0 reviews

Advice needed on driving a truck with a 2 speed rear axle

I'm going to go look at a 76 Chevy 2 1/2 ton truck in about an hour and plan to drive it the 70 miles back home since it is too long to put on my trailer. Most of this driving is on the Interstate. The truck has a 4-speed transmission with a 2-speed rear axle. I have never driven a truck with a multi-speed rear axle and have some quick questions for anyone who has. Do you shift the axle on the fly or just shift it in high or low range before taking off and leave it in that range? Do you use the clutch when shifting the axle? Thanks!

1997 Chevy K2500 reg cab, L65, 5-speed, 3.73 locker
2005 GMC Yukon
1954 Chevy 6100, 327, dump bed, 2-speed axle
1972 Ford F600 dump truck, 330cid V8, 5-speed tranny and 2-speed rear axle
Reply With Quote Quick reply to this message
Sponsored Links
Old 01-22-2011, 09:22 AM   #2 (permalink)
Diesel Fanatic
ehames005's Avatar
Join Date: Oct 2010
Location: Phoenix, Az
Posts: 93
iTrader Score: 0 reviews

Old School Oil Burners (Old SOBs) Member

Idaho Turbo Diesels Member

Usually when you are shifting a axle you go through the pattern then shift the axle into high range and go through the pattern again. As for using the clutch it is always a safe bet to use it. My Peterbuilt does not need the clutch except for take off but it does have modern air shifters the high/low split.

1995 Chevy 2500 4X4 longbed Victory Red
6.5l turbo diesel "F" code Boost gauge
4" straight pipe exhaust
Custom cold air intake
PMD relocated
237,000 miles
33x12.5x17 tires
4.10 gears
Offline   Reply With Quote Quick reply to this message
Old 01-22-2011, 09:32 AM   #3 (permalink)
Just Horsing Around
PrivatePilot's Avatar
Join Date: Jun 2008
Location: Near The Coffee Maker
Posts: 15,643
iTrader Score: 0 reviews

Ontario Diesel Place Chapter Member

My only experience with a 2 speed rear axle is in large equipment, and in this case all that was needed to make the shift was to preselect the shift, and break torque - it does the rest.

(Edit: I missed the "2" before the "1/2" ton. )
Mark - Courtice, Ontario, Canada.
'97 C3500 Crew Cab Long Box Dually 6.5 Turbo Diesel.
Rebuilt with Navistar 506 block spring 2012
Special thanks to Racer55 and WhiteK2500 for their invaluable assistance!
Commercial OTR Driver Since '95

Last edited by PrivatePilot; 01-22-2011 at 09:38 AM.
Offline   Reply With Quote Quick reply to this message
Old 01-22-2011, 09:40 AM   #4 (permalink)
33m racing
Diesel Fanatic
33m racing's Avatar
Join Date: Dec 2010
Location: Magnolia Illinois
Posts: 69
iTrader Score: 0 reviews

You say 2 1/2 ton like c60? If so, I'd leave the axle in low till you get in high gear, then shift the rear axle. You could use the clutch, or burp the throttle.
1993 k2500 extended cab long bed/ 221k mi. 6.2/6.5 hybrid. 660 block, 6.5 heads, intake, turbo. Db2831-4911 pump
Offline   Reply With Quote Quick reply to this message
Old 01-22-2011, 10:09 AM   #5 (permalink)
Tanc Crusher
Diesel Sr. Technical Member
Tanc Crusher's Avatar
Join Date: Jan 2006
Location: Seymour, Indiana
Posts: 9,637
iTrader Score: 0 reviews

INDP Member

The only one I ever drove went like this. You shift into 1st and diff in low. Then next shift will be still in first and shift rear end into high. Next shift is 2nd gear and rear end in low. But will all depend on the transmission and gear it has to whether you may be able to start at the bottom again and work through the gears again.

2007.5 GMT-900 Chevrolet Silverado 2500HD CC/LB LTZ 4x4 Summit White. 4-18-2007. Powered by the LMM Duramax 365hp/660tq coupled to the MW7 Allison 1000 6-speed through the NP1 NP263XHD Transfercase.
Upgrades: Performance Truck Products for 5" MBRP Turboback 6020AL. Alligator Performance for EGR Blocker. DuramaxTuner for EFI-Live with DSP5 ECM Tune and TCM tune. Meyer Performance for Airdog 150 Gen 1 Lift Pump, Diamond Down Pipe. Merchant Automotive for Suncoast IV with 1056 converter, Amsoil Synthetic Fluid in everything, Pitman Arm Fix.
Configure your FlashScan V2 the way it should be
Future: SDP S475 Twin Setup is here-install 6-18-11. On board Air with Side Step Tube Air Tanks, Custom Bed Fuel Tank and Water/Meth Tank.
New Toy: 2012 Dodge Challenger SRT8 Red and all stock for now.

Check out: My Garage for pics of the Truck, Mods, and Toys.
UA Steamfitter, Local 136 Evansville, IN

Last edited by Tanc Crusher; 01-22-2011 at 10:11 AM.
Offline   Reply With Quote Quick reply to this message
Old 01-22-2011, 10:34 AM   #6 (permalink)
Diesel Technician
wingman98's Avatar
Join Date: Oct 2010
Location: Greenwood, Missouri. SW of KCMO about 20 miles.
Posts: 410
iTrader Score: 0 reviews

Old School Oil Burners (Old SOBs) Member

have one like this for 30 years leave in low till you get to 4th thenshift to hig on rear xle actually I am wingmans dad> Ehames005 this a two speed rear axle not a trans as you are used to shifting on your large car You will not go back to 1 as this truck will have a muncie 465 trans.wind it up in 4th pull up on the red button on gear shift burp throttle slowly get back in to the gas and you should be inhigh on rear ax.If it is cold out it will take longer to shift.DO NOT RUSH IT
1993 Silverado K3500 CCLB 6.5TD vin code F, Ranch hand style bumpers front and rear. outback running boards. Dual core all aluminum radiator, including tanks. each core is an inch wide. 4 inch Diamomd Eye Exhaust no muffler, 2.5 crossover pipe, snorkel taken out, A Team Turbo, 285/75-16 Michelin LTX A/T 2s

Originally Posted by BlueBurby1 View Post
but ya whacking is fine....the flange...on your truck....that is....
Originally Posted by acesneights1 View Post
if I ever meet the SOB who invented those stupid squeeze clamps I will put 6 of them on his ballsack
I agree with this.

Last edited by wingman98; 01-22-2011 at 10:39 AM.
Offline   Reply With Quote Quick reply to this message
Old 01-22-2011, 10:34 AM   #7 (permalink)
Dakota Dave
Diesel Technician
Join Date: May 2009
Location: NE north Dakota
Posts: 149
iTrader Score: 0 reviews

Armed Forces Club Member

Just leave it in high and drive home. You should not need Low unless loaded. That should be a syncronised trany. use the clutch to prevent destroying them.
1995 GMC 1500 Ext Cab 6.5TD
Stock with FSD cooler on Manifold. 198,000 miles
3.42 gears 265 75-16s Used mostly to tow travel trailer.
Offline   Reply With Quote Quick reply to this message
Old 01-22-2011, 02:52 PM   #8 (permalink)
Diesel Technician
iceroadman's Avatar
Join Date: Nov 2010
Location: BC West Kootenays
Posts: 222
iTrader Score: 0 reviews

A two speed axle is more or less a kind of an overdrive.
Like others have said you only need it in high gear.
2004 Silverado, DMax/Allison.
Total stock 178000 k.
Offline   Reply With Quote Quick reply to this message
Old 01-23-2011, 10:21 AM   #9 (permalink)
Diesel Head
Join Date: Jul 2010
Posts: 33
iTrader Score: 0 reviews

if you do shift it into high after 4th, dont go back to low until you stop, it can be kinda tricky to hit and the grinding sounds horrible when you miss.
Offline   Reply With Quote Quick reply to this message
Old 01-23-2011, 01:02 PM   #10 (permalink)
6.5TD Post Addict
racer55's Avatar
Join Date: Jul 2010
Location: Scugog Island Ontario Canada
Posts: 9,734
iTrader Score: 0 reviews

Ontario Diesel Place Chapter Member

Old School Oil Burners (Old SOBs) Member

I have found that it takes some experience when deciding to split shift,getting to know the range between the gears will let you know more about when to use hi or low on a given gear and load has a lot to do with it.

As mentioned earlier I ussually would accellerate under load when going from low to high,pull the shifter to high,let off the throttle and wait for the gear to shift and contine my accelleration.

To go from hi to low takes a bit more finness and can be done several ways,deccelerate and drop the switch then slowly rev the engine to try and match the speed(this is tough to do without being harsh on the rear end/drivetrain) or clutch and rev the engine a quick burp and let the clutch out still harsh but less so if you catch it at all.It is easy to miss gears this way and without experience it should not be used for engine braking.

No longer a 6.5 owner
2005 Chev K3500 CCLB Dmax

Diagnostic Checklist 2.0
OBD1 Codes
OBD2 Codes
6.5 FAQ
Carcode & TDCO Instructions

Last edited by racer55; 01-23-2011 at 01:04 PM.
Offline   Reply With Quote Quick reply to this message
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Diesel Place : Chevrolet and GMC Diesel Truck Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

PLEASE READ! You must check your email inbox for the confirmation link to complete registration. Please check your spam box if you do not see the email in your inbox.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
2 Speed rear axle ratiio change DoIt EFILive Tuning Software 0 09-21-2011 04:54 PM
rear axle for OBS needed obnoxus Closed / Archived Marketplace Ads 0 03-27-2010 06:04 PM
ABS speed sensors and rear axle ratios sixto Drivetrain - 2001 - 2010 0 01-31-2009 07:38 PM
2 speed rear axle Snoddytn Drivetrain - 2001 - 2010 15 04-09-2006 09:09 AM

All times are GMT -4. The time now is 03:48 AM.

Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
© AutoGuide

SEO by vBSEO 3.6.0