| Re: Final Drive Options and Recommendations [message #220499 is a reply to message #220331] |
Fri, 30 August 2013 10:09   |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma:
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Senior Member |
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Mickey,
Another vote here for going with the 3.70 from Jim K.
I bit the bullet about two and a half years ago and replaced my 3.07 with a 3.70 limited slip. It was expensive, but it made a big improvement in drive-ability of the coach. I tend to drive no faster that 62 - 65 mph anyway, so the lower gearing hasn't been a disadvantage at speed.
Most 3/4 ton pickups (GVW of 7,500 - 9,000 lbs) of the era had 4.10 rear end gears and most one tons (GVW of 10,000 - 10,500 lbs) had 4.56 gears. These were trucks equipped with a granny gear 4-speed or a three speed automatic (no overdrive). The 3.07 was just too high for the motorhome and was used because it was available off the shelf from Toronado/ElDorado production.
The 3.70 in my heavy 26' coach with the 455 engine made a nice difference in off the line acceleration and, I'm sure, puts less strain on the transmission. I still have to drop it into "super" when climbing. There is no getting around that with a 12,000# vehicle, especially when towing a 3,000# car behind it.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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