Hopefully someone can answer my question since I don't know sh!t about transmissions. I got my swap done into my 84 GMC 4x4 and have been driving it none-stop since Saturday. Runs like a champ! Only problem is, it shifts really hard and it won't go into overdrive. Could it be the fact that I'm not using the original transfer case and it thinks its a 2wd?
A drunk mans words are a sober mans thoughts
1984 GMC Sierra Classic 3/4 ton 4x4
Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD
Do you have both speed sensors connected on the driver side of the transmission?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Yeah they're both there. The rear one is brand new since originally it was just a plug.
A drunk mans words are a sober mans thoughts
1984 GMC Sierra Classic 3/4 ton 4x4
Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD
is there a pulse counter wheel thing in the transmission? Some transmissions didn't have two pickup points in the 80e, one was blocked off and the reluctor wheel thing isnt there.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Yeah the reluctor ring is definitely there. I know its all there because I felt really stupid when I swore up and down that it was a sensor and it turned out to be just a plug. Before I found that out, it wouldn't shift past second gear.
A drunk mans words are a sober mans thoughts
1984 GMC Sierra Classic 3/4 ton 4x4
Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD
It may be your TP sensor? Mine did that and shifted really hard into 2nd and 3rd. The TP sensor was off, but I have a drive by cable.
Jamest
12 Sec. Club! SOLD
La Viuda negra/ a.k.a. Black Betty
LQ4 6.0L, WCCH HEADS, LEVEL 5 FLT 4L80E TRANS. WITH TRANS BREAK, YANK 3200 STALL, TRICK TURBO, TURBONETICS T-76 TURBO, CUSTOM INTERCOOLED, 68lb INJECTORS, CUSTOM S/D TUNE FROM NELSON PERFORMANCE, COMP CAM 212/214 .557/.559 116+2, SNOW METH. KIT, . ALL INSTALLED AND DYNOED AT NELSON PERFORMANCE: 5**?HP @ 5073rpms and 5**TQ @ 4389rpms AT THE WHEELS WITH 10 PSI OF BOOST. ALL 3/4 TON TRUCK 5435LBS, NOTHING TAKEN OFF, STREET TIRES, AND USUALLY 2 BABY SEATS. WANNA RIDE?
SOLD***
Yeah mine is drive-by-cable too. I checked the TP sensor and it checked out ok. A friend of mine who's a hardcore tranny guru is gonna look at it for me tomorrow after work. He's got a kool little scan tool specifically FOR transmissions so he can see exactly what its doing while its doing it. I'll wait and see how it checks out on the test drive.
A drunk mans words are a sober mans thoughts
1984 GMC Sierra Classic 3/4 ton 4x4
Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD
Alright ladies and gents, my friend looked at my transmission for me on a little test drive found out the transmission is perfectly fine, I've just got a sensor problem somewhere. According to his scan tool, the PCM only registers my speed at 35 when I'm really actually doing about 50, and even shifting from drive to overdrive it won't go into 4th gear. So......install a new VSS in my tail house on my t-case or reprogram PCM?
A drunk mans words are a sober mans thoughts
1984 GMC Sierra Classic 3/4 ton 4x4
Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD
is that a late model 80e? Sounds like something is way off in the tune if thats happening. Get your tuner to correct program your PCM for your gear, transmission, transfer case, tire combination.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I think it is a late model, but don't quote me on that. I didn't even think about the gears and tire sizes. I should do that again, only thing is I'm afraid to hook up my tuner to it again. I wiped out everything once I really don't want to do it again lol but I'll give it a shot. Thanks.
Last edited by Podunk; 10-06-2008 at 09:22 PM.
A drunk mans words are a sober mans thoughts
1984 GMC Sierra Classic 3/4 ton 4x4
Dropped in 6.0L LQ4 and 4L80E transmission out of a 2000 Chevy Silverado 2500 HD
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