I have a 1989 with the auto trans...not sure which model E40d or something to that nature. The mechanic for our company sent the tranny off to be rebuilt 6-7 months ago along with a rebuilt transfer cases. The tranny is nice and tight...it just needs a highway gear im tired of it revving all they way out on highway trips. Is there a way to add an overdrive to this tranny?
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Im no Einstein...but I might be a Rocket Scientist !
An E4OD is a 4 speed transmission, a C6 is a 3 speed. Those are the only 2 automatics available with the diesel in 89. A C6 will have a gear selector that reads D-2-1, the E4OD will read OD-2-1. Also, the E4OD will have a overdrive lockout button on the end of the shifter.
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1985 International rollback, 6.9L 5 speed "Li'l Big Truck"
Hmmm I feel your pain as in (no overdrive) [img]/ubbthreads/images/graemlins/mad.gif[/img] on my 1988. When I bought the truck (new) I come to find in (89) is when the OD trany was added [img]/ubbthreads/images/graemlins/rolleyes.gif[/img].
The OD button I belive is where my AC button is located.
After 18 years and 170,000 great miles, a little late in the game for me to add a expensive Gear Vendor [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]
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88 F 250 7.3 Super Cab XLT Lariat4X4...Cream Puff
81 Corvette...Pampered
Harley Shovel 88" Show Stoper...WOW
BBC 468 Jet Boat...Gotta get Wet!
It's the Women that cost me the $$$$
I have the same problem on my 1988 F250. Since I don't expect to pull much with that truck, I think I will have the truck re-geared to something that will give me longer legs. I have 4.10:1 now and I want to go maybe as low as 3.08:1. I am still deciding. It is about $1000 cheaper to re-gear than to add the OD.
Somebody might suggest a ratio that is available and would be the best for a 4X4 with the desire to lower engine RPMs and to increase fuel economy.
Thanks
hweaver
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1990 F-350 7.3 Crew Cab Banks Sidewinder Turbo E4OD 4X4,
1984 F-250 6.9 4X4 4Speed Old Style Banks Turbo (gave to daughter, but still in family)
1988 F-250 7.3 4X4, C-6 Auto, Banks Sidewinder Turbo
There's only a couple of options, one is two suitch to a five speed manual. You can put a e40d in with its set of problems, or a gear vendor which costs around $2500.00. I have a C6 with a 355 ratio and I still only get 10 to 12 miles per gallon. I very seldom drive over 2500 rpms, which is about 60 to 63 mph. If you put very many miles on it you go broke putting $2.50 diesel fuel in it.
Greg
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1988 F250 7.3 diesel 4x4 auto C6 now ZF5
1990 F250 7.3 diesel 4x4 auto E4OD. now ZF5
1992 F250 7.3 diesel 4x4 ZF5
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I have a 1989 with the auto trans...not sure which model E40d or something to that nature. The mechanic for our company sent the tranny off to be rebuilt 6-7 months ago along with a rebuilt transfer cases. The tranny is nice and tight...it just needs a highway gear im tired of it revving all they way out on highway trips. Is there a way to add an overdrive to this tranny?
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I have two vehicles, one with a GV and one with a US Gear (see sig).
The GV shifts automatically, is not designed for heavy hauling. The US Gear can haul anything your truck can pull. It is a push-button switch on the C-6 shifter, engages a bit hard, but is far more robust.
It also allows you to go into 4WD with O-drive. The GV locks you out of 4WD when it's in use.
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If you don't have anything to do, get a used diesel and a camper!
Truck 1: 1985 F350 dually 4WD 6.9 diesel crew cab auto with 83k original miles. C6 trans, 4.10 rear end. Mods are Banks Turbo, US Gear overdrive, 45gal rear tank, hydroboost brakes, additional leaf springs all around, Hellwig airbags, rear sway bar, GM glowplug controller, fuel Koalescer. 235/85 R16 Michelin XB Rib radials. 11ft.6in Vacationeer cabover camper, TorkLift tiedowns.
Truck 2: 1988 F250 7.3, C6 auto, 2WD w/3.55 limited slip rear axle, Banks Sidewinder Turbo, Gear Vendors overdrive, Utility box, hydraulic lift gate, lumber rack.
Auto: 1987 MBZ 300D Turbo 3.0 Liter 6 cylinder engine. 205K miles. Working on all the "little things" that previous owner neglected. Putting in wvo tank.
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