Motorhome & Recreational Vehicle Resource

Since 1996

Search RV-Coach Online

Email Author email Paul  Reply to Message reply to message  Post New Message post new message      search forums
ATTENTION: DO NOT POST ADS IN FORUMS!
All Postings that advertise items for sale will be deleted from the Discussion Forum. You may post sale items for free in the Classifieds section. Sign up now.
All Messages in ThreadAuthorDate
Gearing for School Bus Paul 10-17-03  
I just bought an '83 GMC/Bluebird schoolbus with a GMC 366 "industrial" engine and a 4-spd transmission. Does enyone have any suggestions on how (or if) I could re-gear this beast? Right now it's running around 4,000 RPM at 65mph, I'd like to bring it down to a more (quieter) rpm range.
Paul.James@SNET.net
Re: Gearing for School Bus John the busboy 10-20-03  
First you must determine what type of drive axle you have. Our bus had a Rockwell H-172. The ratio was 6.14.

Then you need to shop around and see if faster gear sets are available. The wrecking yard that handles heavy trucks is a good place to go. So are transmission shops that only do heavy trucks.

If you can't find a faster gear set, then you have to look for a replacement drive axle. This is what we did. Our bus has hydraulic disk brakes and it took a few trips to the salvage yard before one turned up.

We now have a 4.11 drive axle. Makes a big difference.

Gear sets for the H-172 are pricey. We got the whole axle for about the same price as a 4.88 carrier.

The new axle is just a bit wider than the old one. So far the tires haven't rubbed against the wheel well. Our tires are oversize, so if it does become a problem, our next tires will be a little skinnier.

John the busboy
Re: Gearing for School Bus ron 9-12-05  
Sounds like you have a 7.17 ratio in your 83 gmc i have a 85 gmc same problem
Required fields in red
For more info about a field, place your mouse over the More Info icon.
Subject:
Your Name:
Your Email:
Message:



Code is case-sensitive. Helps stop SPAM.
       


Advertise Here
Get Media Kit NOW!






Get Media Kit to Advertise!

Advertiser Links

Back to Top