Hello fellow members. Would anyone know if the rear end from a 77' F100 2wd be ok to use with a 4 speed auto. trans. & 302 from a 85 f150? I plan on putting a mild cam in the 302. Will the factory rear end suffice? I appreciate any advice.

 

Do you mean will the driveshaft fit or will it be strong enough.? What exactly are you wanting to know ? You might want to measure the trans to see if its longer to see if you need a different driveshaft.
What is your truck and what's it got for running gear.? That will help us help you...

 

I'm sorry. What I was wanting to know is will the gears in the factory rear end still be ok to use with the 85' 302 motor & 4 speed trans. I am putting in? Or will I need to change the rear end gears since I plan on putting in a stronger motor than the factory motor? The new motor will be around 350 hp.i believe the gears that are in the rear end now are 3.0

 

Any of the rear ends they used in these trucks should handle the torque from that engine with no problems.

 

Hey bud. Thank you for the reply. Good to know

 

AXLE code stamped on the 2nd line-far right of the Warranty Plate, riveted to the left door face below the latch. Post what it is.

TWO different rear axles were used in 1976/79 F100/150's: Ford 9" & Dana 44. The Dana has an inspection cover, the 9" does not.

The 4 speed A/T is the AOD, one of the worst A/T's foisted on mankind by FoMoCo! Introduced in 1980 misc. Passenger Cars and 1981 F100/150 300/302.

People drove in overdrive in heavy stop and go traffic. The constant shifting up/down .. in/out of overdrive fried the AOD's guts and it didn't take too long for this to occur.

Heat is the mortal enemy of the AOD, figure about 3 grand to overhaul it. And...STAY OUT of overdrive in heavy traffic and install the largest external trans cooler you can find.

 

Thank you very much for the info. I'll be picking up the motor/trans. Sat. Is there anything I could do to improve the trans. before I install it?

 

Like number dummy said get a larger Trans cooler a plate cooler with a thermostat and fan would be the best route. Go to the bull nose forum (80-86) and poke around and see what the guys are doing with these transmissions. You might be better off running a c6.

 

If your rear gears are a 3.0 ratio you will probably find that the tranny will be constantly searching at lower speeds. In order for an overdrive transmission to work properly you will probably need to drop the rear axle ratio to 3.50 or lower, preferably 3.73.

 

The 85 f150 I am getting the motor & trans. from has a 3.55 rear end. Any idea if the gears in the rear end would work or would I have to swap the entire rear end?

 

If it's a 1985 F150, it could have a 8.8" integral rear axle or a 9."

8.8" has an inspection cover, the 9" does not. The ONLY parts that are the same 8.8" vs. 9" is the pinion shaft and 1 pinion bearing and cup. EVERYTHING else is different!

 

According to the tag on the rear end its a 9". The tag# is WDM-AG4 6GB
3.00 9 344D

 

9" rear axle / 3.00-1 / No Limited Slip.

6GB: Assembled the 2nd (B) week of July (G), 1976 (6).

 

If the donor truck has a 3.55 ratio, it's in an 8.8" rear end. There was no 3.55 ratio in a Ford 9-inch rear end. Closest 9-inch ratio to that would have been 3.50:1. 3.73:1 is also not a factory ratio you will find in a Ford 9-inch rear end. Closest Ford 9-inch ratio to that would be 3.70:1.

Easy enough to identify if it's an 8.8". If the '85 donor truck has a cover that bolts onto the back, center of the housing, it's not a Ford 9-inch rear end. 8.8" components are not compatible with a 9-inch rear end.

The AOD was produced from 1980-1993. Pre-'88 models had some internal flaws --most notably, a lack of sufficient lubrication to the output shaft/tail housing bushing. These flaws were finally addressed by Ford with the '88-'93 models.

The AOD was replaced by the AODE. The AOD was completely controlled by hydraulics through the throttle valve cable/linkage. The AODE was controlled electronically through solenoid valves in the valve body, via a PCM.

The 4R70W was the 3rd iteration of the old original AOD design. Like the AODE, it too was shifted electronically but, unlike the AODE and especially the AOD, the 4R70W is a far superior 4-spd automatic overdrive transmission to the other two.

'98-'2004 are the best models of the 4R70W. There's tons of information on the web about this transmission, what's required to control shifting, what applications it will directly bolt to and modifications that can be made to it to be an extremely strong transmission.

1998 3.8L Mustang 4R70W 4-spd automatic overdrive transmission, with 'Windsor' bell pattern, I have to install in my '69 F100.

 

Can u tell what rearend it has by the VIN#? The VIN# on the donor truck is 1FTEX15F2FKA23104