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Old 08-23-2010, 09:29 PM   #1
Junior Member
Join Date: Aug 2010
Posts: 3
1998 Rexhall Anthem differential


My wife and I recently purchased a 1998 Rexhall Anthem with a 454 Gas engine. We were told it was an allison transmission from the dealer we bought it from. We are wondering how to find out what the differential ratio would be for this because at 90 km per hour (55 miles per hour) the engine is revving at 3000 rpm. This seems quite high to me. Is this normal or not? Any help with finding out the gear ratio or suggested gear ratio to change to would be greatly appreciated. We just dont want the motor to run out of the vehicle. Thanks in advance.

VIN 1GBMP37B0W3309937

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Old 08-24-2010, 11:50 AM   #2
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Workhorse Chassis Owner
Join Date: Mar 2007
Posts: 312
As far as I know Chevy/WCC never put an Allision behind a 454. Not until the 8.1 engine was an Allision transmission used. Prior to that a Chevy 4 speed truck trans was used. With add't cooling it should be just fine. The GM part numbers were something like 4LExXX. Someone on here should know the specific numbers. The RPM you're discussing sounds like it may not be shifting into 4 gear.

2005 30' Rexhall Vision, W-22 chassis, 19.5 tires, 208'' factory WB, 6000 CCC
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Old 08-24-2010, 05:40 PM   #3
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Thanks for your info scoutmstr, I to thought at first that the trany was not shifting into 4th but apon paying atention to the shifting as I accelerate I do see that it goes into 4th. I also found out from a heavy truck repair place today that a company close to me here in Calgary would be able to help me out with a differential that would more suite my needs. The company is called "Arctic Gear" for those that may be having the same issues. Hope this may help someone else down the road. I will post back here again after I get the work done and let everyone know what to expect for cost.
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