Home » Public Forums » GMCnet » Power Drive
| Re: [GMCnet] Power Drive [message #327243 is a reply to message #327229] |
Sun, 17 December 2017 23:30   |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
|
Senior Member |
|
|
Vadim,
Double Trouble has a 3.21 to 1 planetary gear final drive. They were OEM equipment in the 1966 & 67 Olds Toronado; GMC "folklore"
notes that they are "bulletproof."
Based on what I've read on the GMC net and my personal experience it's not high speed that will alter the life of a TH425
negatively; it is constantly putting a heavy load on them when you accelerate from a stop.
I do my best to accelerate slowly from a stop up to the speed limit.
I drive whatever the speed limit is; be it 55, 60, 65, 70, or 75.
As noted the Toronado weighed around 4000 lb and the GMC weighs THREE times that much. Once you have the mass in motion the stress
on the transmission drops. Of course it takes more power to move the GMC down the road because of the weight AND the drag.
IIRC I've noted that the RPM's of the 455 with the 3.21 to 1 final drive runs around 2400 at 65 and it loves it! It will cruise at
that rpm range all day long without a hiccup.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Vadim Jitkov
Sent: Monday, December 18, 2017 1:44 PM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Power Drive
Thank you everyone for the warm welcome and for your replies. This is exactly the information I was looking for. I'm just trying to
better understand the purpose of some of the modifications that are on this unit. That way i will know better what its doing and why
when we are on the road...
The answer I hear from the members - leave it as is, slow down to 55 (maybe 60) MPH, chill out and enjoy the scenery :) I plan on
doing exactly that.
--
Vadim Jitkov
'76 Glenbrook 26'
Pullman, WA
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
Current Time: Mon May 13 08:43:19 CDT 2024
Total time taken to generate the page: 0.00879 seconds
|
GMCforum
Search
Help
Register
Login
Home
