GMCforum: GMCnet » Re: [GMCnet] 3:21 final drive. any oppinions

Home » Public Forums » GMCnet » Re: [GMCnet] 3:21 final drive. any oppinions

Show: Today's Messages :: Polls :: Message Navigator

Re: [GMCnet] 3:21 final drive. any oppinions [message #304852]

Wed, 03 August 2016 17:10

BobDunahugh

Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA

Karma: 11

Senior Member

Scott. When I drove your GMC in Cedar Rapids. The engine felt like the cams torque range was higher than stock for a 455. So to get into that good cam torque curve, and higher manifold vacuum. Thus better gas milage. I'd go 3:70. Higher RPM's for the 455 really isn't the issue. You want to match the FD to that cam torque curve.

Bob Dunahugh

78 Royale
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

Report message to a moderator

Previous Topic:	Bathroom Heat Ducting
Next Topic:	Battery Boost Solenoid Repalcement

Goto Forum:

-=] Back to Top [=-

Current Time: Wed Oct 09 10:17:38 CDT 2024

Total time taken to generate the page: 0.00599 seconds