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-   1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks (https://www.ford-trucks.com/forums/forum37/)
-   -   1980 F100 2wd Front End Retrofit (https://www.ford-trucks.com/forums/1581824-1980-f100-2wd-front-end-retrofit.html)

jstodden 05-01-2019 10:56 PM

1980 F100 2wd Front End Retrofit
 
My 1980 F100 has a broken radius arm on the driver side. I'd like to replace it, but I haven't been able to find many new parts for these trucks.

I also have a 1986 F150. Can a person retrofit the newer front end onto the older truck? I'd really like to be able to find parts for my truck.

dagwood57107 05-02-2019 04:03 AM

Here is a to an amazon part. Otherwise you can google search by part number: F1TZ-3A360-B

jstodden 05-02-2019 11:11 AM


Originally Posted by dagwood57107 (Post 18631650)
Here is a link to an amazon part. Otherwise you can google search by part number: F1TZ-3A360-B

I don't think that part will fit my truck. If I recall correctly my truck's radius arms look different. I believe my truck is the light duty f100 with the king pin axles and the small bolt pattern.
https://cimg5.ibsrv.net/gimg/www.for...5412ff7625.png

Rusty_S 05-02-2019 11:52 AM

1980-81 : F100 - F150 radius Arm # E0TZ-3A360-D

The big difference is 80-81 used a forged radius arm and 82 - 86 used a stamped radius arm. Outside of that kingpin or balljoint I see no mention of it making a difference on the part number for the radius arm.

No listing on ebay but you might be able to find one listed online if you feel inclined to do some digging.

dagwood57107 05-02-2019 12:18 PM


Originally Posted by Rusty_S (Post 18632231)
1980-81 : F100 - F150 radius Arm # E0TZ-3A360-D

The big difference is 80-81 used a forged radius arm and 82 - 86 used a stamped radius arm. Outside of that kingpin or balljoint I see no mention of it making a difference on the part number for the radius arm.

No listing on ebay but you might be able to find one listed online if you feel inclined to do some digging.

Thanks Rusty. I have an 82 F100 and mine are ok - surface rust but solid so I've never looked for these. Are the 87-96 the same fitment as the 80-86?

Rusty_S 05-02-2019 07:10 PM


Originally Posted by dagwood57107 (Post 18632273)
Thanks Rusty. I have an 82 F100 and mine are ok - surface rust but solid so I've never looked for these. Are the 87-96 the same fitment as the 80-86?

The frames are the same up to 1996 I believe. The headers I got for my '82 F150 are listed as fitting 86-96 year models and I looked up the OEM Y pipe part number as these shorty headers fit oem Y pipes and the Y pipe was the same in 1980 as it was in 1986 which tells me 1980 - 1996 should be the same frame.

But that doesn't mean the suspension stayed the same how ever. Like 80 - 81 was forged steel beams while '82 and up was stamped steel.

jstodden 05-02-2019 08:27 PM


Originally Posted by Rusty_S (Post 18632925)
The frames are the same up to 1996 I believe. The headers I got for my '82 F150 are listed as fitting 86-96 year models and I looked up the OEM Y pipe part number as these shorty headers fit oem Y pipes and the Y pipe was the same in 1980 as it was in 1986 which tells me 1980 - 1996 should be the same frame.

But that doesn't mean the suspension stayed the same how ever. Like 80 - 81 was forged steel beams while '82 and up was stamped steel.

My 81' F100 has the swiss cheese frame, so I'm not sure the broad generalization of the frames being the same is accurate.

Has anyone here actually used the later radius arm on the older truck, or has anyone actually swapped the newer front end onto the older frame?

Rembrant 05-02-2019 08:29 PM


Originally Posted by Rusty_S (Post 18632925)
Like 80 - 81 was forged steel beams while '82 and up was stamped steel.

The stamped front beams were not 1982-up...they were only around for a short time, possibly only in 1982. When they went to the ball joint front ends, the beams were forged again.

So there were a couple different front beams with the 2wd king pin trucks (Forged, and stamped). When they went to ball joints (1983?) then they all became the same thickness (5") up to 1996.

There are no replacement radius arms available for the 1980-1986 2wd trucks that I'm aware of, new or aftermarket. They are available for the 1987-1996 trucks, but they are different on the bushing/frame end. I have a set of the 87-up radius arms on my 1984, and they fit just fine as long as you use the 87-up radius arm bushings.

For the 1980-1982 2wd kingpin trucks, there are really only two options to replace the radius arms. Repair the old ones (weld in new rods that usually wear/rust out inside the bushings), OR, swap in a newer ball joint front end.

Rusty_S 05-02-2019 09:00 PM


Originally Posted by Rembrant (Post 18633054)
The stamped front beams were not 1982-up...they were only around for a short time, possibly only in 1982. When they went to the ball joint front ends, the beams were forged again.

So there were a couple different front beams with the 2wd king pin trucks (Forged, and stamped). When they went to ball joints (1983?) then they all became the same thickness (5") up to 1996.

There are no replacement radius arms available for the 1980-1986 2wd trucks that I'm aware of, new or aftermarket. They are available for the 1987-1996 trucks, but they are different on the bushing/frame end. I have a set of the 87-up radius arms on my 1984, and they fit just fine as long as you use the 87-up radius arm bushings.

For the 1980-1982 2wd kingpin trucks, there are really only two options to replace the radius arms. Repair the old ones (weld in new rods that usually wear/rust out inside the bushings), OR, swap in a newer ball joint front end.

Well my '82 has ball joints and it has stamped front I beams. From all I read '82 was the first year for ball joints 81 was still kingpins.

Rembrant 05-03-2019 03:28 AM


Originally Posted by Rusty_S (Post 18633105)
Well my '82 has ball joints and it has stamped front I beams. From all I read '82 was the first year for ball joints 81 was still kingpins.

My bad on the stamped beams...sorry, I thought they were only on the very end of the kingpin trucks. Maybe it was just the very beginning of the balljoint trucks. In any case, the stamped I-beams were only around very briefly, maybe only in 1982. The beams went back to being forged shortly afterwards. Numberdummy could explain better.

See the link below, Number Dummy shows the dates when the stamped beams started and ended. Production from 8/81 to 6/83. That would be model year 1982 and most of 1983.

https://www.ford-trucks.com/forums/1...mped-axle.html

My 1984 has forged beams, so I haven't paid close attention of the the pre-84 trucks;).

Rusty_S 05-03-2019 12:47 PM


Originally Posted by Rembrant (Post 18633404)
My bad on the stamped beams...sorry, I thought they were only on the very end of the kingpin trucks. Maybe it was just the very beginning of the balljoint trucks. In any case, the stamped I-beams were only around very briefly, maybe only in 1982. The beams went back to being forged shortly afterwards. Numberdummy could explain better.

See the link below, Number Dummy shows the dates when the stamped beams started and ended. Production from 8/81 to 6/83. That would be model year 1982 and most of 1983.

https://www.ford-trucks.com/forums/1...mped-axle.html

My 1984 has forged beams, so I haven't paid close attention of the the pre-84 trucks;).

lol I don't focus on much outside of '82 unless I have to. Such as exhaust which is where I found out 80 - 86 use the same Y pipe so a '86 - '96 shorty header should really state it fits 80-96 as the Y pipes are the same. Or the sending unit, which I might add fuel injection to my 82, simple just toss on a '84-'86 16gal saddle tank and throw in a '84 sender to maintain functionality of my oem fuel gauge as ohm values changed in '85.

Outside of that I only know about 82 as it mainly pertains to my truck. I know my is stamped and that kinda bums me out as I got it in my head forged beams would be stronger than the stamped beams I have.

Franklin2 05-03-2019 01:07 PM


Originally Posted by jstodden (Post 18633052)
My 81' F100 has the swiss cheese frame, so I'm not sure the broad generalization of the frames being the same is accurate.

Has anyone here actually used the later radius arm on the older truck, or has anyone actually swapped the newer front end onto the older frame?

I have never personally done it, but people in here do it all the time. The most frequent reason is because they want to lower their truck, and the company that makes the lowering beams only makes them for the newer trucks like you mentioned. So they swap the complete frontend out of a newer truck under their older f100, and then at the same time they install the lowering beams.

If you take the whole thing complete, newer radius arms, newer axles newer spindles, newer brakes and the 5 on 5.5 wheels, the whole thing will bolt in under your truck. If you have the small car pattern rims you can swap the rearend out of the later f150 in place and that will give you the larger pattern wheels for the rear also.

Franklin2 05-03-2019 01:09 PM

P.S. If you find a 4x4 f150 up to 1996, and would like to go 4x4, you can bolt the 4x4 frontend in place also. Of course you would have to change the transmission also to get the transfer case to bolt up. But the 4x4 is a bolt in also.

jstodden 05-03-2019 01:17 PM


Originally Posted by Franklin2 (Post 18634172)
I have never personally done it, but people in here do it all the time. The most frequent reason is because they want to lower their truck, and the company that makes the lowering beams only makes them for the newer trucks like you mentioned. So they swap the complete frontend out of a newer truck under their older f100, and then at the same time they install the lowering beams.

If you take the whole thing complete, newer radius arms, newer axles newer spindles, newer brakes and the 5 on 5.5 wheels, the whole thing will bolt in under your truck. If you have the small car pattern rims you can swap the rearend out of the later f150 in place and that will give you the larger pattern wheels for the rear also.

Thank you for the information. I'll try researching "lowering 1980 F100" and see what I can find.

FuzzFace2 05-03-2019 05:36 PM


Originally Posted by jstodden (Post 18633052)
My 81' F100 has the swiss cheese frame, so I'm not sure the broad generalization of the frames being the same is accurate.

Has anyone here actually used the later radius arm on the older truck, or has anyone actually swapped the newer front end onto the older frame?

What was meant was the dimensions for the frames are all the same. So the parts as a whole will swap between them.


Originally Posted by jstodden (Post 18634185)
Thank you for the information. I'll try researching "lowering 1980 F100" and see what I can find.

You will not find much for the 80-81 kingpin trucks.
DO NOT cut coils to lower the front this will only cause other issues you cant fix ......... easy.
DJM beams I think now list a drop beam but it is only for 1 size kingpin and our trucks could have 2 different sizes. It is my luck the suspension I went with, I have both size pins, is not the size DJM makes them for. http://djmsuspension.com/
For me to use the ones DJM makes them for I would need to get wheels for as I don't have any wheels for it, oh also need to swap the rear axle to match wheel bolt pattern.

BTW IIRC the lowering beams are for the 5x4.5 wheel bolt pattern kingpins NOT the 5x5.5 pattern.
As you can tell I have looked into this and what I found.
Dave ----


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