How much power can an AMC 20 handle? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > General Technical Discussions > Engines & Drivetrain > How much power can an AMC 20 handle?

Premium LED Lighting by VISION X, Proudly sold at ROCKRIDGBds fox ipf 2.0 racing series shocks now available at rockEngo winches available at www.rockridge4wd.com! Free shipp

Reply
Unread 12-13-2013, 09:21 PM   #1
Jimbocj7
Registered User
1983 CJ7 
 
Join Date: Jan 2013
Location: Mauston, WI
Posts: 8
How much power can an AMC 20 handle?

I have a '83 CJ7 Renegade. I am currently in the process of building a 351M to drop in. I am estimating around 250-300 Hp when completed. I will be using the transmission and transfer case from the 77 F250 (engine donor truck).

My main question is which axles to use. My current driveline setup is as follows:
AMC 258
T4
Dana 300
AMC 20 Rear
Dana 30 Front
(unknown axle ratios)

I have the axles from the truck: Dana 44-6CF HD closed knuckle front, Dana 60 HD rear (full floater) (axle ratios 4.09:1). The rear axle is in great shape needing only brakes and hub seals. The front needs new kingpin bearings, ball seals, and possibly the wheel, carrier bearings and brakes.

My current axles are in need of some attention also: rear needs one side wheel bearings, inner and outer seals on both sides, maybe pinion bearings; the front needs ball joints and tie rods.

I am perfectly fine with the full width axles. I am a welder/ fabricator and can make my own flares. I am leaning towards the truck axles because they are heavier duty and would probably hold up better. My jeep is not my DD, mostly a weekend warrior type of thing. I also have limited funds so I need to pay some attention to cost, but I also want to build it to last reliably.

What do you guys think? Keep my axles(probably convert the rear to one piece axles) or go with the heavier truck axles? How much power can an AMC 20 handle?

Thanks guys!!

P.S. My entire driveline (not sure on the axles yet) will probably be for sale by the beginning or middle of January. I will post details in the classifieds section When I get things taken out.

Jimbocj7 is offline   Reply With Quote
Unread 12-14-2013, 12:23 AM   #2
jnicewan
Registered User
1995 ZJ 
 
Join Date: Dec 2010
Location: Norman, OK
Posts: 2,006
Just my opinion here but the money you throw at the AMC 20 to make it stronger would still not be as strong as the stock D60. The biggest strength in the AMC 20 is the ring/pinion. The axle shafts are weak unless you buy the one piece design, even doing that you run into problems on wheel bearings and seals, some kits can make it hard to find seals and bearings plus the bearings aren't exactly huge either. The AMC 20 axle tubes are weak too but can be trussed and welded, still not going to be as strong as a stock D60. There are more upgrades and parts, and gear ratios available for the D60 too. The full size axles will have larger bearings and brakes for bigger tires and extra weight or future weight of rig.

If anything I would maybe look into replacing that closed knuckle 44 and try to at least find an open knuckle 44. The closed knuckle 44 is a little weaker, and has some oddball harder to find parts. A Chevy 10 bolt front end is almost identical to the D44 in size and strength, they are newer and easier to find. The golden answer is finding a D60 front then maybe are larger rear like a D70 or 14bolt.
jnicewan is offline   Reply With Quote
Unread 12-15-2013, 01:11 PM   #3
schitzangiggles
King of Macastan
 
schitzangiggles's Avatar
1993 YJ Wrangler 
 
Join Date: May 2005
Location: Rigby, Idaho, Macastan (Idaho)
Posts: 6,000
The AMC 20 in a CJ, not the same as one out of a Waggy.

Look at the 14bolt for the rear as they are a lot of them at very low prices compared to a D60. You can shave the bottom of the housing to pick up a bunch of clearance. If you only need to go to 5.13 and up, go with the 14b, if you need a lower ratio like say 6.50, then go with the D60. Since you already have the D60, and the 44 from the '77 ford F250, just run those and either keep an eye out for a D60 front end, or pick up another D60 and make your own front axle. That way you can build it as money and time permit, but get to heel today.
__________________
"Axeheads are supposed to be sharp, but you are one blunt tool."
FLynes



If you love wealth more than liberty,the tranquility of servitude more than the animating contest of freedom, go home from us in peace. We seek not your counsel nor your arms. Crouch down and lick the hand that feeds you. May your chains sit lightly on your shoulders and may posterity forget that you were our countrymen.
-Samual Adams

A government big enough to give you everything you want is big enough to take everything you have.
Thomas Jefferson

Calling Illegal Aliens "Undocumented Immigrants" is like calling drug dealers "Unlicensed Pharmacists"

Nemo Me Impune Lacessit
"No one provokes (attacks) me with impunity".


"Your right, the Tea Party and the OWS are the same, just like the America Revolution and the French Revolution were the same. The only problem is the American Revolution ended with Liberty, Freedom, Justice for all and a shining light upon a hill. The French Revolution ended with lynchings, guillotines, murder and socialism. So yeah, I could see how one could confuse the two..."

Mac Wilson
schitzangiggles is offline   Reply With Quote
Unread 12-16-2013, 06:15 PM   #4
Jimbocj7
Registered User
1983 CJ7 
 
Join Date: Jan 2013
Location: Mauston, WI
Posts: 8
I am thinking I will probably run the D44 and D60 for now and possibly upgrade in the future. I just need to freshen them up and on they go. Thanks
Jimbocj7 is offline   Reply With Quote
Unread 12-17-2013, 07:41 PM   #5
jeepdaddy2000
Web Wheeler
 
jeepdaddy2000's Avatar
1971 CJ5 
 
Join Date: Jan 2002
Location: Eagle Point Oregon
Posts: 6,108
I think you better dump that T4........
jeepdaddy2000 is offline   Reply With Quote
Unread 12-17-2013, 11:42 PM   #6
jp360cj
Registered User
1977 CJ7 
 
Join Date: Oct 2007
Location: Greenville, North Carolina
Posts: 1,719
The F250 will have a driver side drop front axle and your CJ is passenger side drop. if you use the ford tcase you can't use your Dana 30.
__________________
77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
jp360cj is offline   Reply With Quote
Unread 12-18-2013, 09:34 PM   #7
uberxj92
Registered User
1992 XJ Cherokee 
 
Join Date: Oct 2012
Location: umatilla, florida
Posts: 1,898
Buddy of mine spent $3000 trying to repair and build up his amc20. He has a slightly modded 304 in a cj. Junk axle. Use the donors. They held that nice engine in a much heavier truck. They'll be more than good in a cj
__________________
http://www.jeepforum.com/forum/f177/92-xj-sadness-2075657/index2.html
uberxj92 is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.