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Re: [GMCnet] Power Drive [message #327217 is a reply to message #327213]

Sun, 17 December 2017 15:19

powwerjon

Messages: 849
Registered: March 2013

Karma:

Senior Member

I think that I have had almost every different drive ratio setups in the GMC’s that we have owned in the last 18 years. Our first was a 77 EL II with a 403 and a stock 3.07 ratio final drive. It was cruising at 2280 RRPM as 64 MPH. It was lacking in performance at anything under 75 MPH. Above that it got up on the cam and pulled and ran well. The first change we did was go with a 3.55 final drive. Running at 64 MPH the RPM moved up to 2880 RPM and would run well and really pull when doing a pass. Our current GMC is a 30” Buskirk Stretch with a 461 Jasper Olds with MPFI, 3.21 final and a 3.50 chain drive giving a effective 3.66 final ratio. Understand that the coach weighs14,800# pulling a loaded as a trailer Honda CRV at 3800# with a total of 18600# when we travel to and from Tucson. We run 65 MPH and pull most grades without problems. The one grade that is more difficult is the grade up the mountain from White Sands to Los Cruses a very long climb. Have done both ways and they both work well.

J.R. Wright
GMC GreatLakerTech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan (On Location in Tucson)

> On Dec 17, 2017, at 12:19 PM, Glenn Giere wrote:
>
> I've had one in mine for years. Works great. Can't find any disadvantage. No need to mess with spedo error as its ratio to rear end is unchanged.
> --
> Glenn Giere, Portland OR, K7GAG
> '73 "Moby the Motorhome" 26'
>
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		[GMCnet] Power Drive By: USAussie on Sun, 30 May 2010 16:33
		Re: [GMCnet] Power Drive By: Mr ERFisher on Sun, 30 May 2010 16:44
		Re: [GMCnet] Power Drive By: USAussie on Sun, 30 May 2010 16:56
		Re: [GMCnet] Power Drive By: USAussie on Sun, 30 May 2010 17:11
		Re: [GMCnet] Power Drive By: Rick Williams on Sun, 30 May 2010 17:44
		Re: [GMCnet] Power Drive By: Kingsley Coach on Sun, 30 May 2010 18:09
		Re: [GMCnet] Power Drive By: Ken Henderson on Sun, 30 May 2010 18:19
		Re: [GMCnet] Power Drive By: Chr$ on Sun, 30 May 2010 18:27
		Re: [GMCnet] Power Drive By: USAussie on Mon, 31 May 2010 01:08
		Re: [GMCnet] Power Drive By: USAussie on Mon, 31 May 2010 01:22
		Re: [GMCnet] Power Drive By: Bill Massey on Sun, 30 May 2010 18:37
		Re: [GMCnet] Power Drive By: Dan Borlase on Mon, 31 May 2010 11:47
		Re: [GMCnet] Power Drive By: Larry on Mon, 31 May 2010 12:49
		Re: [GMCnet] Power Drive By: zhagrieb on Mon, 31 May 2010 15:09
		Re: [GMCnet] Power Drive By: jimk on Mon, 31 May 2010 15:40
		Re: [GMCnet] Power Drive By: RF_Burns on Mon, 31 May 2010 16:01
		Re: [GMCnet] Power Drive By: Mr ERFisher on Mon, 31 May 2010 16:07
		Re: [GMCnet] Power Drive By: jimk on Mon, 31 May 2010 18:54
		Re: [GMCnet] Power Drive By: mike miller on Mon, 31 May 2010 21:25
		Re: [GMCnet] Power Drive By: USAussie on Mon, 31 May 2010 22:14
		Re: [GMCnet] Power Drive By: Chr$ on Mon, 31 May 2010 23:13
		Re: [GMCnet] Power Drive By: BobDunahugh on Sun, 17 December 2017 10:03
		Re: [GMCnet] Power Drive By: BobDunahugh on Tue, 19 December 2017 09:08
		Re: [GMCnet] Power Drive By: NextGenGMC on Wed, 20 December 2017 01:46
		Re: [GMCnet] Power Drive By: zhagrieb on Sun, 17 December 2017 13:19
		Re: [GMCnet] Power Drive By: powwerjon on Sun, 17 December 2017 15:19
		Re: [GMCnet] Power Drive By: James Hupy on Tue, 19 December 2017 17:58
		Re: [GMCnet] Power Drive By: Kingsley Coach on Wed, 20 December 2017 11:43
		Re: [GMCnet] Power Drive By: RF_Burns on Wed, 20 December 2017 06:19
		Re: [GMCnet] Power Drive By: Matt Colie on Wed, 20 December 2017 07:29

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