C6 needs overdrive
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Freshman User
Joined: Jun 2007
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C6 needs overdrive
I've got an 89 250 4x4 7.3L desiel and a C6 tranny (3 speed auto). Is there any conversion or adapter kit that will give me overdrive because I dont have it right now? Right now my 7.3L runs 3000 rpm at 55-60 mph (pretty high for a desiel motor).
Elder User
Joined: Nov 2006
Posts: 614
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From: Pensacola, FL
i agree with the others, the gearvendors overdrive is cool and effective, but not cheap. going to a higher ratio in the axle would be cheapest thing to do. you will lose some low end power with a higher ratio but the diesel's torque should still be sufficient.
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Freshman User
Joined: Jun 2007
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gearvendors vs. new gear
I've got a 4.10 gear in the rear end. I've thought of switching to a 3.73, but I haul heavy loads in the long bed (2000-4000 lbs) fairly often and am reluctant to give up my 4.10. I'll look into the gearvendors though because I don't plan on getting rid of the truck ever. thanks.
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Elder User
Joined: Nov 2006
Posts: 614
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From: Pensacola, FL
if you tow loads more than you don't then the gearvendors is probably a good investment. not sure how it mounts on a 4wd, whether before or after the tcase, either way one or both of your driveshafts will need to be changed. the rear will definately have to be shortened. i still don't think going to a slightly higher gear will hurt your towing though with the diesel.
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Senior User
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OD manual and a gear vendors will really give you some good ratios to work with...
I drove an f-550 with od manual, gearvendors splitter and a tailshaft od as well for a total of triple overdrive. It was four wheel drive (6 wheel if you ask me) and they only came with a 5 sumthin gears in their first years at least. The owner/builder wanted the motor to lope easy at 80... It would roll out REAL FAST!!! We pulled a 36,000 pound trailer across the nation and it was even better after the 100 horse chip but to maintain low pyrometer temps we split the gears to acclerate than popped the 3rd OD at 65 or so... After the 100 horse chip we did put on 4 inch from turbo to engine brake and 5 inch pipe to 5 inch turn out stacks to draw heat out of the pipes better... but even with the low ratio final gears we could run well over 125 with the truck since the chip did away with the top end speed shut off...
enter...
I drove an f-550 with od manual, gearvendors splitter and a tailshaft od as well for a total of triple overdrive. It was four wheel drive (6 wheel if you ask me) and they only came with a 5 sumthin gears in their first years at least. The owner/builder wanted the motor to lope easy at 80... It would roll out REAL FAST!!! We pulled a 36,000 pound trailer across the nation and it was even better after the 100 horse chip but to maintain low pyrometer temps we split the gears to acclerate than popped the 3rd OD at 65 or so... After the 100 horse chip we did put on 4 inch from turbo to engine brake and 5 inch pipe to 5 inch turn out stacks to draw heat out of the pipes better... but even with the low ratio final gears we could run well over 125 with the truck since the chip did away with the top end speed shut off...
enter...