Rearends
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Junior User
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From: Bonne Terre,Mo 63628
Rearends
I have noticed that a lot of you have mentioned in your posts what your trucks are and what moter and rear-end they have. So with that in mind i have a 68 f250 2wd 390 auto. Where and how can i find what the rear-end is, and what should have came in this truck?. It seems to me that if i had a posi track (factory) not one that has been welded, there would be a lot less tire spinning and more acceleration, You know pinned to the seat when you hammer it. Where would i find such a rear-end for this truck?? And would it be practical to put it in this truck??? Thanks guys, MY 390.
Lead Driver
Joined: Jan 2003
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From: Ohio
You need to determine what type of rearend you have, Dana or 9". Likely a Dana(has a removable cover on the back side). If it's never been touched, there will be a tag on one of the cover bolts that gives you the information you need. It will state gear ratio(3.70, 4.10, etc) and if it's a Traction lock it will have an "L" next to the ratio on the bottom line of the tag.
Purchasing a "posi" for a Dana is not cheap. Haven't priced one lately so can't say for sure, but with installation it will be well over $500. Someone that might have better information, please say.
Purchasing a "posi" for a Dana is not cheap. Haven't priced one lately so can't say for sure, but with installation it will be well over $500. Someone that might have better information, please say.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Originally Posted by MY 390
Where and how can i find what the rear-end is, and what should have came in this truck?. It seems to me that if i had a posi track (factory) not one that has been welded, there would be a lot less tire spinning and more acceleration
What's the axle ratio? Does it have Limited Slip? (Posi-Traction is a chebbie term).
Here's how to tell: Look on the Warranty Plate, left door face below the latch, second line at the far right, for the AXLE code.
Post what it is, once decoded, that'll give you the ratio and whether it has LS or not.
Or...
FTE has an AXLE decoder...look above on this page for ARTICLES/SPECS.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Originally Posted by MY 390
I just looked it says G-37 for axle, if i read it right.
37 = Axle Code: Dana 60 / 3.54-1 / non Limited Slip / 5200 lb. Rear Axle Capacity
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From: Bonne Terre,Mo 63628
WOW, That is cooooooL, thank you very much. I really appreciate that, maybe you can reverse code and tell me what a posi-track (chebbie) would be?? Or something as good as a posi-track. If it is not called a posi-track then would you call it ???
Street Queen to the extr3m3
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From: Lubbock, Texas
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From: Bonne Terre,Mo 63628
so numberdummy, can you tell me how i might decode a limited slip, or posi when i am at the junk yard?? What to look for visually and any numbers?? If you have time and feel like it, thanks.
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Ford Parts Specialist
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From: Simi Valley, CA
Originally Posted by MY 390
so numberdummy, can you tell me how i might decode a limited slip, or posi when i am at the junk yard?? What to look for visually and any numbers?? If you have time and feel like it, thanks.
3.54's are rare, and desirable. Most Dana 60's have 3.73's or 4.09's...some even have 4.56's or worse...4.88's. Now you know why ppl want 3.54's!
DANA 60 WARRANTY PLATE AXLE CODES FOR LIMITED SLIP ~ 1965/79 F250 (1961/64 IS different!)
B4 = 3.23-1 / B5 = 3.54-1 / B6 = 4.88-1 / C7 = 3.73-1 / C8 = 4.10-1
The rear axle tag, with its specific code (if still on the rear axle, they are usually missing), will not match the axle code on the Warranty Plate.
Rear Axle Tag: Either a Dana 7 digit number code (example: 603010-1) is used, or a Ford ID code like: C8TA-AA is used...or a combo of both.
I just looked, the codes are mind boggling...every year uses a different version of the 7 digit code, you'd need the parts catalog to decode them all. There also the Ford codes, which consists of, for example: C8TA-AA. These codes change from year to year. C8TA is 1968, C9TA is 1969, D3TA is 1973...etc.
The only EZ way I can think of, is either phone me via cell phone from a junkyard, (I'm usually home) or email me the codes. You can email me off FTE, just click on my user name.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Originally Posted by reifwj
help me out, mine says g 24
Transmission Code G: = C6
AXLE CODE 24: Dana 60 / 4.10-1 / non Limited Slip / 5200 lb. Rear Axle Capacity.
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
Originally Posted by reifwj
That's correct. from what i know about rear ends, this is better for highway driving. other than that, are there any other advantages to having the weaker rear end.
The lower the number is for cruising.
Your engine turns 4.1 times per the tire rotation of 1.
Say you were running a 3.00, the engine would only turn 3 revs to do the same thing.
John
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Joined: Mar 2008
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From: Idaho
This is what i read.
Lower ratios are generally desirable when going off-road. Higher ratios are better for freeway driving since they run at lower RPM’s and offer better fuel economy.
not trying to argue, just want to make sure i understand. all help is greatly appreciated.
Lower ratios are generally desirable when going off-road. Higher ratios are better for freeway driving since they run at lower RPM’s and offer better fuel economy.
not trying to argue, just want to make sure i understand. all help is greatly appreciated.