Hi All:
Info specific to Grant Schaefer but good for all GMCers who tow or want to upgrade their final drive:
Mike/The Corvair a holic
> Mike. This is what I tried to send Grant. Bob D
>
> From: Bob Dunahugh
> Subject: Towing.
>
> I'm the guy that Jim Hupy was talking about. Sometimes I'm pulling my 24 ft enclosed trailer. With one of my Yenkos in it. The Royale comes in at about 12,000 lbs. The trailer at another 12,000 lbs.
>
> Howell/GM EFI, and a 3:70 final drive are two of the best upgrades that I ever did. This is how my tail pipe looks since Tucson. You can't even get a tissue tinted by whipping it inside.
> Since putting on the GM/Howell EFI EBL. On the trip out East in Oct. My GVW was at 17,000 lbs + with towing Linda's handicap lift van. Averaged 8.3 MPG over 1200 miles. On Ethenal. 87 octane. 78 Royale, 403 with the 3:70 FD. Have about 21,000 miles on the EFI. Ran to perfection. When I put the 3:70 in. And rebuilt the trans myself. Back in 2004. Gas mileage went up.Trans temps went down. Never travel without something in tow. 106,000 miles. All is well. Do change trans fluid yearly. Call if you wish. Iowa. Cell 319-521-4891
>
> Bob Dunahugh
> 78 GMC 403 Royale
> 4 COPO Yenkos
>
Info specific to Grant Schaefer but good for all GMCers who tow or want to upgrade their final drive:
Mike/The Corvair a holic
> Mike. This is what I tried to send Grant. Bob D
>
> From: Bob Dunahugh
> Subject: Towing.
>
> I'm the guy that Jim Hupy was talking about. Sometimes I'm pulling my 24 ft enclosed trailer. With one of my Yenkos in it. The Royale comes in at about 12,000 lbs. The trailer at another 12,000 lbs.
>
> Howell/GM EFI, and a 3:70 final drive are two of the best upgrades that I ever did. This is how my tail pipe looks since Tucson. You can't even get a tissue tinted by whipping it inside.
> Since putting on the GM/Howell EFI EBL. On the trip out East in Oct. My GVW was at 17,000 lbs + with towing Linda's handicap lift van. Averaged 8.3 MPG over 1200 miles. On Ethenal. 87 octane. 78 Royale, 403 with the 3:70 FD. Have about 21,000 miles on the EFI. Ran to perfection. When I put the 3:70 in. And rebuilt the trans myself. Back in 2004. Gas mileage went up.Trans temps went down. Never travel without something in tow. 106,000 miles. All is well. Do change trans fluid yearly. Call if you wish. Iowa. Cell 319-521-4891
>
> Bob Dunahugh
> 78 GMC 403 Royale
> 4 COPO Yenkos
>