i have a 93 6.5td with a 4l80e trans it will not shift into overdrive all the time some time it does but not all the time any idea guys
i have a 93 6.5td with a 4l80e trans it will not shift into overdrive all the time some time it does but not all the time any idea guys
Simple stuff first. Have you changed the filter and fluid in the last 10K miles? I don't know squat about transmissions, except that changing f/f has cured erratic shift problems for me, even if I've changed it three months ago.
'94 Suburban 2500 6.5L 2WD Trailer RPO
'89 Reg. Cab 2500 6.2L 2WD Manual 4sp
'83 Suburban 1500 6.2L 4WD 700R4
'83 Blazer 1500 6.2L 4WD 700R4
Miscellaneous Gassers
First thing to do is check for diagnostic codes. If it wants to shift and can't it'll store a code.
I lost OD once after I replaced the pump. The variable speed sensor on the side of the pump was out of adjustment. Most of the things that go wrong w/a 4l80e is electronic.
92 GMC std cab C2500, Kennedy high flow injectors,port matched, Banks exhaust & gauges, intercooler, 97 cooling, Turbo Master.A means for a Toy
I had same problem with mine and no codes in computer. It turned out to be the speed sensor on engine at rear where a distributor would be if it had one. This unit is also the oil pump drive unit with a pulse xmitter on top.
Here is where I have been buying most of my parts direct from GM for the best price and free shipping over $100.00. Great service and fast ship from dealer...
John Dickinson
Team Chevrolet,Olds,GMC,Jeep,Nissan
2014 E.20th Place
Scottsbluff, NE 69361
308-632-2173/800-658-4017
fax 308-632-0974
email: teamparts@teamchev.com
Hope this helps...
1992 GMC Sierra("2003 TDP Photo Contest Winner") 6.5L Turbo Diesel, 4L80E Auto, 4x4, 3" Body Lift, 33"x12.5"x16.5" Tires, Back Country Nerf Bars, Banks Stinger Kit, Banks Pillar Pod, Banks Boost, Pyro, Trans Gauges, Kennedy Quick Heats, Lube Specialist Oil Lines cooler kit,
2001 GMC Sierra EC K2500 6.6L 4x4 Duramax-Allison Long Bed, Predator 40hp program.
Same problem with mine when I bought it, needed a new tps in the tranny. Needed a whole new tranny about 12k miles later.
\'93 6.5<br />Home made boost controller<br />80,000 RMP (Rabid Muskrat Power)