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Ford 8.8 conversion |
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mixed up 
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Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2177 |
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 Posted: Dec/30/2018 at 6:42am |
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agree any factory ls as its limits and as far as cost and availability hands down the 8.8 is the best candidate for a swap in these cars it used to be most ford 8 or 9 inch every car out there had one and now the 8.8 is the rear end every ford rear wheel drive has one
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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one bad rambler
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Joined: Jan/09/2008 Location: On The Island Status: Offline Points: 2007 |
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Posted: Dec/30/2018 at 6:33pm |
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 68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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amxron
AMC Nut
Joined: Nov/18/2011 Status: Offline Points: 295 |
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Posted: Jan/09/2019 at 12:02am |
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Back in 1973 I built a rear for my 70 AMX. Had Ken Keir weld the tubes in and brace the mounts. Used a
AMC 4.44 gear set and put one extra steel in the clutch pack ( a 390 left hand thread unit ). Henrys axles rounded out the install. Have made many, many 6000rpm hole shots with 9'' slicks over the years with no problems. I see no reason to change rear housings to Ford or Mopar unless you are deep in the 10's. There is really no reason to use rear discs unless you are running a high horsepower road race car. AMX's and other short wheelbase cars will swap ends in a second anyway. Ford used 11" discs and 9" drums on Fox Mustangs for the right braking balance and 10" rear drums on Fox wagons. I also have a Fox body Mercury Zephyr that I added a Mustang 8.8 and T-Bird rear discs to. Had to put a proportioning valve on it to dial down the rear pressure so the rear didn't lock up first even with a 109" wheelbase. AMC-20's have 29 spline axles which are slightly stronger than 28 spline Fords, both 8.8"& 9" rears. 31 spline Fords are stronger of coarse, but, with them you need a nodular center section, Daytona pinion support and a big bearing housing and brakes. Of coarse you will have to figure out an e-brake system and fluid lines too. So maybe it's better to modify your AMC-20, it was for me, your choice. Good luck, Ron. |
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AMXron
Fleet/Jeep Mgr. Orbit AMC/Jeep 50-1787 |
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Red Devil
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Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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Posted: Jan/09/2019 at 9:46am |
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The AMC20 29 spline is actually a fair bit stronger than the Ford 28 spline.
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Trader
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Joined: May/15/2018 Location: Ontario Status: Online Points: 6881 |
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Posted: Jan/09/2019 at 10:06am |
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I don't believe anyone is arguing that an AMC 20 cannot be built better or be better then the Ford 8.8.
The problem for many is part availability and cost comparison. Many parts of North America you cannot locally find an AMC 20 let alone one that fits your specific needs. Then you have the cost of upgrading it. For my location, I can buy 4 Ford 8.8's complete with disk brakes for the cost of one piece AMC 20 axles. Then both need work but the Ford 8.8, I can get parts locally at a fraction of the cost. Example would be a friend just spun a hub last year. He looked at the cost of finding, buying and shipping in an AMC 20 for an axle or solid axles vs putting in a Ford 8.8. The Ford 8.8 with modification was far cheaper. And don't even go to find a Ford 9", MIA, unless your willing to sell your first born.
Edited by Trader - Jan/09/2019 at 10:10am |
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tufcj
Supporter of TheAMCForum 
Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4088 |
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Posted: Jan/09/2019 at 12:35pm |
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The Explorer 8.8 I put in my Rogue cost me $110 out the door with rotors and calipers (3.73, posi) at the local pull-n-save. The extra short axle was $20. It cost me $135 at a local shop to have the long side of the housing narrowed for 2 short axles and tanked. I have a total of $265 invested. The axles in the Explorer 8.8 are 31 spline. Bob tufcj
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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70BBOAMX
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Joined: Sep/30/2008 Location: South Carolina Status: Offline Points: 568 |
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Posted: Jan/09/2019 at 7:29pm |
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The Explorer 8.8 in my 1994 Jeep Wrangler was a breeze to swap in. Just weld on some spring perches and shock mounts. The width was very close to stock. The driveshaft didn't even need to be modified. The stock posi did not care for rock crawling with 33 inch tires though and I bought a slightly used Richmond Traction system ( no setup required) on ebay for $400. So for a total of $600 I have a 31 spline 3.73 locked 5 on 4.5 disc brake axle. It has performed flawlessly on the street and trail for over 15 years. Whats not to love?
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iwantmyx
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Joined: Jun/14/2018 Location: texas Status: Offline Points: 45 |
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Posted: Jan/21/2019 at 2:12pm |
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What year Ranger and what do you have to do to to bolt in to the javelin
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232jav3sp
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Joined: Jan/09/2013 Location: Texas Status: Offline Points: 2451 |
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Posted: Jan/21/2019 at 6:15pm |
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I would have no issues going to an AMC20 in my 1969 Rambler IF I could find one for a small body car, that is! I have an Explorer 8.8 that I got for free. It's an older drum brake unit with 3.27:1 gears. Worst part, it's an open diff. Still, not going to have much in it. I want to go to the local "you pull it" and grab the short axle and disc brakes out of a later Ford.
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Trader
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Joined: May/15/2018 Location: Ontario Status: Online Points: 6881 |
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Posted: Jan/22/2019 at 7:01am |
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This site will give you lots of info on the Ford 8.8:
For your application, you need to determine if you need 28 or 31 spline and your axle width. Your torque/HP will determine the spline count and there are many posts on the fouum on axle widths for your vehicle and year.
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Mopar_guy wrote:
Just because you don't like them doesn't mean they're junk.