4 Wheel Drive/SUVs/1999 Chevy Truck

Advertisement

Expert: - 10/7/2007


Question
When my trucks shifts from 1st to 2nd gear it jerks. I have had the transmission serviced like I am supposed to. What could this be? How can I tell if it is the drive line or universal joint?

Answer
Elaine,

I don't know how many miles you have on the truck, but you may need to have a shift kit installed for smoother shifting.  I am assuming that you have an automatic transmission.

As far as the drive line goes, the universal joint is the part of the drive line that fails.  You can crawl under the truck, and wiggle/turn the drive line by hand and see if there appears to be some play in it.  There should be little or no movement in the drive line if the universal joints are good.

It wouldn't hurt to take the truck to a reputable transmission shop and have them check out the transmission and the universal joints.

Carl

4 Wheel Drive/SUVs

All Answers

Answers by Expert:

Ask Experts

Volunteer

Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

©2012 About.com, a part of The New York Times Company. All rights reserved.