Gear ratio change
Question:
Carroll, Neither. There are aftermarket devices that correct the speedometer error. Whomever sells you the gear sets can steer you straight. Try www.ring-pinion.com. Dean – Hide quoted text — Show quoted text – >I have a ‘90 GMC FS 4×4 Jimmy with a 700R4 transmission. It came from the >factory with 3.08 road gears. Gas mileage is good but I wouldn’t try pulling >much with it. I would like to go to a 3.73 rear (and front) differential >ratio. Question: >Will I have to change a gear in the tranny or perhaps have the computer chip >changed fo the speedometer to still read correctly? >Carroll Senn >Columbia, SC
Response:
I changed to 3:73 gears on my 95 Suburban and I had to change the vehicle speed sensor buffer located under the computer to correct my speedometer. It costed about $80.00.
– Hide quoted text — Show quoted text -> I have a ‘90 GMC FS 4×4 Jimmy with a 700R4 transmission. It came from the > factory with 3.08 road gears. Gas mileage is good but I wouldn’t try pulling > much with it. I would like to go to a 3.73 rear (and front) differential > ratio. Question: > Will I have to change a gear in the tranny or perhaps have the computer chip > changed fo the speedometer to still read correctly? > Carroll Senn > Columbia, SC
Response:
I have a ‘90 GMC FS 4×4 Jimmy with a 700R4 transmission. It came from the factory with 3.08 road gears. Gas mileage is good but I wouldn’t try pulling much with it. I would like to go to a 3.73 rear (and front) differential ratio. Question: Will I have to change a gear in the tranny or perhaps have the computer chip changed fo the speedometer to still read correctly? Carroll Senn Columbia, SC
