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mis-matched gears.can I run 'em

J

jones

1/2 ton status
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May 17, 2004
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Location
IONIA,MI USA
just popped the lid on a 12b rear/D44 front and found...
12b-4.11's(37-9)
D44-4:09(45-11)
Being that they aren't that far off,can I run them ok?PO claims to have no problem running these axels.
No,I didn't buy these axels.They were given to me with tough country E-Z ride 6in lift rear springs attached and a raised steering arm on the flat-top knuckle D44.
 
:D You will be fine, IIRC some older furds with 9" rears had 3.50's and the fronts had 3.55's from the factory.
 
i've seen a truch go thru the mud bog here w/3,73's up front and 4.56 or 4.88's in the back, was 1 of 2 trucks that made it thru the 4' deep goo, they had cut 44 boggers and 454 & another truck just like it, they showed up at the mud bog in a semi, drove their trucks off the lo-boy to the pit and proceeded to show em how it was done! there was trucks runnin at it, and sticking w/abrupt stop 1 truck length in..these boys had to pull front end out in the goo to lock in 4x4, it was pretty cool listening to those big blocks howl thru the tractor pull headers while going 2-3 mph, drivers just waving at the bleechers...the fast turning front kept the front up..the low gears pushed him thru,..when he went thru his truck was on a 45* angle, you could just see the tops of his front tires paddling, couldn't see the back tires at all! mud was @ 1' from coming over the tailgate, and front bumper was barely in the mud...wouldn't have believed it if i hadn't seen it!
 
i had 4/10 4/11 in a 3/4 ton truck all righ very slow speed but s%ck any thing above 20 mph could not steer the truck and ate ujoints for lunch one winter plowing 6 ujoints so no i would not have any diff in gears for on road at all just trail would be alright
 
great!thanks guys.I thought I was gonna be axel shoppin'alot sooner than expected.
 
tourdog said:
i had 4/10 4/11 in a 3/4 ton truck all righ very slow speed but s%ck any thing above 20 mph could not steer the truck and ate ujoints for lunch one winter plowing 6 ujoints so no i would not have any diff in gears for on road at all just trail would be alright
Click to expand...

hmm, sounds like something else was wrong if it was that bad. many trucks do not have the same ratios from the factory. hell, the 14 bolt had 4.09, 4.10, and 4.11 all available from the factory.
 
Chaddy said:
Huh?
Wouldnt that destroy the T-case?
Click to expand...


To add to the previous answer. It's not that uncommon to see truck that only get run in mud bogs to have differn't ratios front to back. The added wheel speed keeps the front end up. I've even seen mud/sand drag racers who run differnt sized tires front to back, running mixed ratios. But this is to keep the tires spinning at the same speed.
 
thats what i want to know how to figure...so i could run 54 boggers in the rear w/my 44 front tsl's..have it setup to swap out the whole rearend/springs and all...w/54 i could use 6'' lift springs and a zero rate/would match my 12'' lift/d60 added a inch so leave the rear longer shackles and it should be pretty level...run it like that in the bog and 44's all around on street
 
tourdog said:
i had 4/10 4/11 in a 3/4 ton truck all righ very slow speed but s%ck any thing above 20 mph could not steer the truck and ate ujoints for lunch one winter plowing 6 ujoints so no i would not have any diff in gears for on road at all just trail would be alright
Click to expand...

WTF? Definetly had nothing to do with the gears.
 
toomany said:
To add to the previous answer. It's not that uncommon to see truck that only get run in mud bogs to have differn't ratios front to back. The added wheel speed keeps the front end up. I've even seen mud/sand drag racers who run differnt sized tires front to back, running mixed ratios. But this is to keep the tires spinning at the same speed.
Click to expand...

To add to the addition... it also helps to keep going straight in the mud drags.
 
well i have seen a few reply asking wtf but to fill in here is the quick story had 3/4 ton sfr with 4:10s put a 1 ton ff14 bolt in it but snow came run out of time to get the 60 put in in front so run the 10 bolt front end for winter plowing snow cound not drive any were in four wheel drive had to kick in the transfer in two hi to drive from drive way to driveway broke ujoints all winter long had enough of that spring came put 60 in truck have not had promble yet been 4 years can drive 50 -60 mph in four high no prombles . the 14ff had 4:11 gears with the two diffent gears could not streer truck over 20 mph so thats my story and my expereance i wont never run diffent gears unless it was just off road and diffent size tires on and on but thats my 10 cents
 
They came from the factory with 4.09s front and 4.10 or 4.11 in the back... Ive parted out two 3/4 ton trucks with as far as I know factory axles and they were both set up that way.
 
tourdog said:
well i have seen a few reply asking wtf but to fill in here is the quick story had 3/4 ton sfr with 4:10s put a 1 ton ff14 bolt in it but snow came run out of time to get the 60 put in in front so run the 10 bolt front end for winter plowing snow cound not drive any were in four wheel drive had to kick in the transfer in two hi to drive from drive way to driveway broke ujoints all winter long had enough of that spring came put 60 in truck have not had promble yet been 4 years can drive 50 -60 mph in four high no prombles . the 14ff had 4:11 gears with the two diffent gears could not streer truck over 20 mph so thats my story and my expereance i wont never run diffent gears unless it was just off road and diffent size tires on and on but thats my 10 cents
Click to expand...

The problem wasn't because of the difference in 4.10 vs. 4.11 gears, there was obviously something else going on. There is more of a difference in the rolling radius between the front and rear tires either because of manufacturing tolerances, or simply the front being squashed down more because of the weight of the plow, then there is between 4.10 vs. 4.11 gears.
 
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