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07-08-2011, 03:12 PM
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#1
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Senior Member
Vintage RV Owners Club Texas Boomers Club Fleetwood Owners Club
Join Date: May 2011
Location: Cherokee, Texas
Posts: 406
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How to determine Axle Ratio.
I have looked at the rear axle and there are no tags to be found. I'm trying to determine the rear axle ratio,model etc on my 84 Winnebago Chieftain. I can't find anything via the VIN# to help either. Any ideas?
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1979 "Vintage" Pace Arrow 28 Ft,
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07-08-2011, 04:07 PM
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#2
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Senior Member
Vintage RV Owners Club
Join Date: Jul 2010
Posts: 218
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look to see if you have a weight tag to see what your gross is. it may be there. also are you running gmc stuff or what?
Outlaw
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John & Colleen Weston & Cassie(our cat) -Olympia,WA
1978 GMC Midas Class A 30FT-454 Engine, 400 T
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07-08-2011, 04:30 PM
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#3
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Senior Member
Vintage RV Owners Club Texas Boomers Club Fleetwood Owners Club
Join Date: May 2011
Location: Cherokee, Texas
Posts: 406
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Quote:
Originally Posted by Outlaw45
look to see if you have a weight tag to see what your gross is. it may be there. also are you running gmc stuff or what?
Outlaw
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Yep Chevy Chassis. P30/32. GVWR is 11,800 lb. Looks like there was a tag under the hood that was riveted on at one time long before I became its owner.
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1979 "Vintage" Pace Arrow 28 Ft,
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07-08-2011, 04:37 PM
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#4
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Senior Member
Vintage RV Owners Club
Join Date: Jul 2010
Posts: 218
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i beleve it's a 4:10. i think that is what mine is. any reason other then just wanting to know? do you have the 454 in yours? probly does. i only get about 7 mpg out of mine. if i decide to keep it i'll hot rod the dist. and carb and do a couple of other things to see if i can get 10mpg out of it.
Outlaw
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John & Colleen Weston & Cassie(our cat) -Olympia,WA
1978 GMC Midas Class A 30FT-454 Engine, 400 T
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07-08-2011, 05:01 PM
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#5
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,948
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A crude method to approximate the axle ratio is to take a string and mark and tape it to the bottom of the drive shaft. Run the string out to the side. Now mark the bottom of the tire at the center line. Now drive it forward with some one watching the mark on the tire and have then tell you to stop after one revolution of the tire. Shut down the rig and set the emergency brake. Now crawl under and mark the bottom of the drive shaft and count the number of revolutions the string is wrapped and estimate the partial wrap. Just over 4 wraps would be a 4.10, just over 4-1/2 wraps would be a 4.56 and just over 5......
For a bit more accuracy, you have the room and some one to walk along feeding string, go for 3 revolutions of the tire and when you count the wraps, divide by 3 for the axle ratio.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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07-08-2011, 05:06 PM
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#6
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Senior Member
Vintage RV Owners Club Texas Boomers Club Fleetwood Owners Club
Join Date: May 2011
Location: Cherokee, Texas
Posts: 406
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Yep its a 454. I'll give the string method a try.
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1979 "Vintage" Pace Arrow 28 Ft,
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07-08-2011, 05:25 PM
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#7
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Senior Member
Newmar Owners Club
Join Date: Jan 2010
Posts: 4,589
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Here's another method:
Jack up 1 wheel, mark it and the driveshaft. Turn the driveshaft until the wheel has turned exactly 2 revs. The number of turns of the shaft equals the axle ratio.
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2007 Newmar DSDP 4023
Discovery is seeing what everyone else has seen and thinking what no one else has thought.
If you want to see what man made go East; if you want to see what God made go West.
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07-08-2011, 05:41 PM
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#8
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Senior Member
Join Date: Apr 2011
Posts: 125
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Quote:
Originally Posted by RJay
Here's another method:
Jack up 1 wheel, mark it and the driveshaft. Turn the driveshaft until the wheel has turned exactly 2 revs. The number of turns of the shaft equals the axle ratio.
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This is incorrect. Wheel turn only 1 rev, not 2...
Chris
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07-08-2011, 08:04 PM
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#9
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Senior Member
Join Date: Feb 2011
Location: Snowbird - Waterford Mi and Citrus Springs Fl.
Posts: 3,609
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Quote:
Originally Posted by HoRotica
This is incorrect. Wheel turn only 1 rev, not 2...
Chris
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That would be true if BOTH rear wheels were off the ground...
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1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
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07-08-2011, 08:14 PM
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#10
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Senior Member
Newmar Owners Club
Join Date: Jan 2010
Posts: 4,589
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Yup, fat fingers, I should have proof read it. Thanks
__________________
2007 Newmar DSDP 4023
Discovery is seeing what everyone else has seen and thinking what no one else has thought.
If you want to see what man made go East; if you want to see what God made go West.
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07-10-2011, 08:24 PM
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#11
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Senior Member
Vintage RV Owners Club
Join Date: Jul 2006
Location: Sauvie Island, OR
Posts: 2,596
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Look on the pumpkin. It's either on a stamped tag between the pumpkin cover bolts, or its stamped on the pumpkin housing itself, most times.
When in doubt, climb under and take a couple pictures, always good for confirmation .
A couple axle brand guesses are:
Eaton
Spicer/Dana
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