Grant:
I suggest you call or e mail Bob Dunahugh out of Iowa. He is a long time GMCer w/ lots of towing experience and is a very qualified mechanic. I know his is a 403 and I believe he has a 3:70 final drive. He tows a full size van or an enclosed trailer w/ one or two Corvair autos - lots of experience - upwards of 20,000 # max. w/ the trailer and 2 autos.
He is a good guy and very willing to share his experiences.
Based on his advice I am going to go w/ the 3:70 on my 76 - 28’er (2’ stretch) - weighs 14,500# & usually towing a Corvair (2,500#), in the future!
Mike/The Corvair a holic
Sent from my iPhone
>
> If you are going to be towing more then about 2500 lbs I’d go with the 3.70 differential . I used to tow a jet boat from your neck of the woods with
> 3.21 gears to the Colorado River (Blythe ) and it was good but towing a small car into the Sierra Nevada mountains a 3.70 gear set was a must have.
> The fuel mileage didn’t seem to change much and engine noise at 65 wasn’t a problem when you consider the extra performance. It is a real bummer
> if you are geared high and you are on a steep mountain grade towing your car in first gear and you don’t think you are going to make the top. This
> is what convinced me to get the 3.70 gears .
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
>
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I suggest you call or e mail Bob Dunahugh out of Iowa. He is a long time GMCer w/ lots of towing experience and is a very qualified mechanic. I know his is a 403 and I believe he has a 3:70 final drive. He tows a full size van or an enclosed trailer w/ one or two Corvair autos - lots of experience - upwards of 20,000 # max. w/ the trailer and 2 autos.
He is a good guy and very willing to share his experiences.
Based on his advice I am going to go w/ the 3:70 on my 76 - 28’er (2’ stretch) - weighs 14,500# & usually towing a Corvair (2,500#), in the future!
Mike/The Corvair a holic
Sent from my iPhone
>
> If you are going to be towing more then about 2500 lbs I’d go with the 3.70 differential . I used to tow a jet boat from your neck of the woods with
> 3.21 gears to the Colorado River (Blythe ) and it was good but towing a small car into the Sierra Nevada mountains a 3.70 gear set was a must have.
> The fuel mileage didn’t seem to change much and engine noise at 65 wasn’t a problem when you consider the extra performance. It is a real bummer
> if you are geared high and you are on a steep mountain grade towing your car in first gear and you don’t think you are going to make the top. This
> is what convinced me to get the 3.70 gears .
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
