Hard shifting into gear - Chevy and GMC Duramax Diesel Forum
Transmission Shop Discuss the Allison OEM, aftermarket, and the ZF-6.

 
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post #1 of 10 (permalink) Old 06-16-2011, 03:40 PM Thread Starter
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Hard shifting into gear

I noticed today that when going from park to drive or reverse, the shift isn't smooth anymore. It is like an abrupt jerk. Any ideas on what can cause this?

2007 CCSB LBZ
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post #2 of 10 (permalink) Old 06-16-2011, 04:32 PM
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bump for ya

Josh-2006 lbz ccLb 4x4 @ 8080 lbs
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post #3 of 10 (permalink) Old 06-16-2011, 05:29 PM
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First, check the U-joints-!

Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
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post #4 of 10 (permalink) Old 06-16-2011, 05:33 PM
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^i was going to say that but didnt wanna sound like a dumbass

Josh-2006 lbz ccLb 4x4 @ 8080 lbs
Performance:diamond eye 5 inch, efi by rob,3 inch dp,Bd manifold,s&b,pvc,afe mp-plugged,air dog ll,edge cts,3 inch boost tube,ppe race valve,alligator trans lines,trans go,pump rub fix
Interior:
weathertechmats,clarion dvd head unit,12"subs,kenwood speakers
Exterior:tint,black lowpro toolbox,halo projector's,5000k hid,moog idler/pitt,rancho shocks,backup camera,cognito 7-9,35s,bmf novas,trac bars,iron bull bumpers,piaa lights
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post #5 of 10 (permalink) Old 06-16-2011, 05:47 PM
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When I was running my ppe it did that whenever I changed tunes. It would do it a few times then stop and go back to normal. Idk if that's your problem or not.

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post #6 of 10 (permalink) Old 06-16-2011, 05:50 PM
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Did you check the tranny fluid level? Might want to consider changing the Spin-on transmission filter and see whats in it or on its magnet.

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post #7 of 10 (permalink) Old 06-16-2011, 06:20 PM
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Change your spin on Alli filter, it is clogged causing a pressure change in the torque converter during engagement resulting in a clunk.
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post #8 of 10 (permalink) Old 06-16-2011, 06:38 PM
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Not to highjack bit where can I get a magnet? Mine wasn't on the filter when I bought my truck

03 CCSB EFI + 5" STRAIGHT PIPE + 33X12.50 18S ON EAGLE ALLOY 197'S + 250K MILES
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post #9 of 10 (permalink) Old 06-16-2011, 07:12 PM Thread Starter
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I'll check that all out in the morning. Thanks y'all. It prolly needs a filter.

2007 CCSB LBZ
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post #10 of 10 (permalink) Old 06-16-2011, 07:31 PM
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Can get a magnet off of one of the vendors, GM, or an Allison dealer.
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