rear end ratio
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Shops, Barns, Varmints, and Trucks
Forum Description: anything you want to talk about except politics
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=149645
Printed Date: 06 May 2024 at 9:32pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: rear end ratio
Posted By: Les Royer
Subject: rear end ratio
Date Posted: 19 Apr 2018 at 5:07am
|
This fall will be my third, (yes count em) third attempt to get down thar to the Ozarks to ride with thet wild Thad Brown Hitchcock gang. I'll be stopping in Smithville to pick up ole Jesse james along the way. So far my best attempt was 89 miles into a 405 mile trip only to break down an return home. An since the newest Ferd (2011 F-250) couldn't git the job done, well I thought maybe I'd try the oldest one. I don't have ole Ted's 1976 Ferd here yet with thet gas guzzlin 390 here yet, so we're gonna go with a 1991 F-150 with a 300 six banger and 4 speed automatic. It has to pull a 14 foot V nose enclosed trailer with the harley and gear inside, along with the nurse an her stuff. . it's got 31-10.50 tires on it which don't seem to be much different than the stock 235/75 tires. But I gotta rebuild the rear end. The spider gears are worn out fer whatever reason. An I'm getting this vibration from somewhere. I already tried new U joints and balancing the drive shaft. Do I stay with the 3.55 gears or do something different? Yeah, it's a 4x4. ------------- I still gots my A/C but it's clear out in the barn now. |
Replies:
Posted By: DMiller
Date Posted: 19 Apr 2018 at 5:42am
| The ratio will not cause it to vibrate nor eat the spider gears, shock loading or severe side loads can, as well the 'Unsprung Weight' off balance of the 31-10.50's can. I had large tires on a 77 Chevy three quarter ton a number of years yet long ago, it too ate the differential spider gears as well u-joints but had a minimal lift of just 3" and joint angles were all good. |
Posted By: Thad in AR.
Date Posted: 19 Apr 2018 at 6:18am
| 3.55 seems kind of hi for an OD trucko. Changing to a 3.73 would make it pull better but you’d have to change the front as well. Mine has 3.08 and that’s way too high. Mine isn’t OD. |
Posted By: jaybmiller
Date Posted: 19 Apr 2018 at 6:38am
|
um...4X4 so BOTH FRONT and rear diff gears will NEED to be changed ! bet the front one will be 'fun' to do.... 3.55 sounds like a 'highway/mpg ratio, 3.73 good for loads. I'd stay with the 3.55 Now a TRUE biker , would forgo the truck and trailer, and just ride the hog.....hehehe ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: darrel in ND
Date Posted: 19 Apr 2018 at 6:46am
| Well Les, hauling the Harley shouldn't even make it break a sweat. But,....if your nurse packs for a trip the way my nurse packs for a trip, then you had ought to just abort the mission now, until you can put something like a 379 Pete in front of that trailer. Suppose you have a "shoe closet" in that trailer somewhere....? Darrel |
Posted By: shameless dude
Date Posted: 19 Apr 2018 at 7:38am
| LMAO @ Darrel....Les....listen to Darrel, he's got it figgered out right! oh...and what's wrong with taking the motorhome and pull the trailer with that? |
Posted By: Dakota Dave
Date Posted: 19 Apr 2018 at 9:40am
|
I wouldn't regear for a trip. I have regeared trucks that we're going to run oversized tires but 31" is a stock sized tire. I've got 3.42 in my suburban 245 -75r16 s are 31" diameter. I don't pull my 7500 lb camper in overdrive just leave it in drive and it runs about 2500 rpm at 65 mph. That puts me right in the torque curve and it pulls real nice. With a lighter trailer I use overdrive but it's only running around 1700 rpm at 65 my trailer have trailer (ST) tires they are rated for 65mph just like all trailer rated tires. So I try to keep the speed down. |
Posted By: Thad in AR.
Date Posted: 19 Apr 2018 at 10:43am
| Hi gears only get better mpg on flat hwy travel and not towing. Round here high gears mean a gutless has hog. My 300 6 gets 9 mpg with 3.08 gears around here. It doesn’t see 60 mph 5 times a year. |
Posted By: Ted J
Date Posted: 21 Apr 2018 at 8:49pm
|
You know, if you'd a come an got that Ferd, it'd out pull anything you've got and keep on going down the road.....till you get by another gas station. Are there any auto/truck junk yards around any more?? Change out the whole rear end. ------------- "Allis-Express" 19?? WC / 1941 C / 1952 CA / 1956 WD45 / 1957 WD45 / 1958 D-17 |
Posted By: Les Royer
Date Posted: 23 Apr 2018 at 4:23am
9 mpg? I was upset mine only got 11. Did a run to Des Moines an back and with some city driving mixed in I got 13. Somebody toll me if'n ya port an polish it, tamper with the air box and get it to move air a little better, you can get em to gets 18. I pit a vacuum gauge on it and under about half load up hill it loses all it's vacuum. I tried it on the 96 and it's didn't make any difference but I'm gonna try driving it with the exhaust undone. If if that makes any difference. ------------- I still gots my A/C but it's clear out in the barn now. |
Thad in AR. wrote:Posted By: Thad in AR.
Date Posted: 23 Apr 2018 at 7:38pm
| Remember mine is carbureted. The carb is junk. I plan to put on a offenhauser manifold and a 2v or 4v carb. |