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F1 Rear end width...to axle...to housing?

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Old 03-07-2018, 11:39 AM
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F1 Rear end width...to axle...to housing?

I have a 51 F1 which I have installed TCI's parabolic leaf spring kit and now I am looking for a rear end....might go junkyard crawling for an 8.8 or order up a new 9" from who knows yet but after some searching here i'm still puzzled as to the optimal width AND if that measurements is from outside axle flange to outside axle flange or outside housing flange?
I've picked up from searches here the 95 and up Explorer 8.8 or 57-72 9" thing but what width I need is still a mystery, admittedly rear end talk is a bit foreign to me as I don't pay much attention till it breaks and off to the Ring and Pinion shop it goes.

Thanks in advance for any info

 
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Old 03-07-2018, 12:16 PM
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There is an article on here (somewhat corrupted, lots of strange symbols) with all the info needed: https://www.ford-trucks.com/articles...rential-swaps/
 
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Old 03-07-2018, 02:26 PM
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I bought my 9 inch custom housing and 31 spline axles from this guy: John?s Industries - Ford 9 inch Rear Ends Housing Axles Caspian, M

Housing width was 61 inches axle flange to axle flange. The width from housing flange to housing flange will depend on whose brake package you choose and the required brake offset needed for that particular kit. I installed this Wilwood kit: Wilwood High Performance Disc Brakes - Rear Brake Kit Product Number: 140-12209-D
So my housing flange to housing flange width was 56 inches.

There is a lot of info needed and choices to be make if you go with a custom 9 inch housing I did not have the housing supplier install the spring pads as I wanted that done by the shop I used to install some other work on my housing. That way the housing was straightened once after all the welding was done. Yes, the housing will have to be straightened after welding is done on it.

More questions are welcome.

Philip
 
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Old 03-08-2018, 10:56 AM
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Ford 9"

I am so joining this thread, I am bound and determined to loose this almost 5to1 in my M3, because of my 1st gear being almost ,what6 to 1, I will be able to get away with a 3.25 maybe even a 2.75
final drive ratio, that article or story of the history of rear gear boxes is of much interest here,THANKS!!
Greg
 
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Old 04-26-2018, 01:11 AM
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So after researching some more and seeing that the Explorer 8.8 is actually a tad narrower than stock and needs wheel spacers I am wondering has anyone gone with a bit narrower rear so they could fit the max tire in the rear fender? and what did your axle face to axle face width & wheel/backspace/tire combo end up as?

Also if anyone wants to chime in on their gear ratio/tire height combo and how much they like it that would be welcome.

I am thinking of going with a T5 trans 2.95 first gear and a 3.50 rear end ratio
 
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Old 05-11-2018, 06:49 AM
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If anyone is interested this has been a helpful site in trying to find the best rear end/tire combo for my truck..... unfortunately I'm still hem-hawing around whether to order a 59"(explorer width) or 61"(stock width) wheel mounting surface rear end as I want to maximize the wheel width

https://tiresize.com/tiresizes/255-60R15.htm

Also if you bring up a T5 trans on Summit's website it has a calculator where you plug in 3 of the 4 (gear/tire size/rpm/MPH ) and it calculates the missing figure, keep in mind T5's 4th gear is the 1:1 final ratio the calculator runs on not the .63 to 1 5th gear so you will get an idea but highway RPM will be lower which is a plus in my book.
 
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Old 05-11-2018, 11:07 PM
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Hey Ratty,
We put a 2001 salvage yard Explorer 8.8 in our 1950 F1. It was $125 & came with 3.73 gears, disc brakes, & limited slip diff.
It's a very nice set up for our 351W/AOD ... cruises all day long at 65/70 mph. We did go with 1 inch spacers to get the
wheels to look right in the fender but it hasn't been a big deal.

Good luck up there north of Detroit! (That sounds cold just typing that).

Ben in Austin
1950 F1
 
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Old 05-17-2018, 07:59 AM
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I used a 1975 Chevelle 8.5 inch 10 bolt rear end under my 49 Ford F-1. It is 60 inches wide from wheel mounting surface to wheel mounting surface, so it is within one inch of the stock F-1 width. I believe that 73-77 Chevelles all have the same rear end. The only drawback to using this rear end is that you have to remove all the coil spring bracketry and weld on a pair of leaf spring pads. It was not a hard job and the 3.08 gear was perfect for my truck.
 
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Old 06-07-2018, 10:06 PM
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When you guys say you had to use 1" spacers to make the wheels to look right are you using stock wheel/tires and they look too sunk in?

My plan is getting as much tire in there as possible without having issues so my thought is to go with a 59" wheel to wheel mounting surface like the explorer rear end, Although reading RIMROCK F1 thread on his "BELLE" build it seems he has 10" worth of tire in there with a 61.5" rear end....Hmmmm

Uhg I over think Everything!

https://www.ford-trucks.com/forums/1...thread-16.html
 
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