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Gen II with a 4 sp auto? |
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FuzzFace2
AMC Addicted Joined: Jul/05/2007 Location: Angier, N.C. Status: Offline Points: 10343 |
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You can look into the GV unit and to buy an adapter for the OD trany you want to use if there is an adapter. Then you have to buy and maybe rebuild a trany to use so what are you upo to $$ wise?
Dave ----
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TSM = Technical Service Manual
75 Gremlin X v8 for sale 70 Javelin 360/auto drag car 70 Javelin 360/T5 Street car |
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Buzzman72
AMC Addicted Joined: Sep/15/2009 Location: Southern IN Status: Offline Points: 2713 |
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Phoenix Transmissions has a 700R4 for $1755 and change:
At this point you're around a grand to the good: Now add your Novak adapter kit: In round numbers, you're still $500 to the good by adapting a 700R4 to your engine, vs. installing a Gear Vendors overdrive. Which is probably why the GV OD isn't recommended by as many people...after all, to those of us with "that AMC mentality," 500 bucks saved is a manifold and carburetor bought. |
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Buzzman72...void where prohibited, your mileage may vary, objects in mirror may be closer than they appear, and alcohol may intensify any side effects.
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AMXFSTBK390
AMC Addicted Joined: Oct/22/2013 Location: SF Bay Area Status: Offline Points: 3489 |
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So far, I have converted four performance cars to transmissions with overdrive. My favorite one is the Bowtie Overdrives 2004R Level II with a 2200 stall convertor. Handles 450hp/450 ft lbs. In a AMX the ideal axle ratio would be between 3.50 and 3.73. The gear ratios in the 2004R are spaced ideally for performance cars. For comparison sake look at the numbers:
2004R 1st gear 2.72 2nd gear 1.57 3rd gear 1.00 OD .67 7004R 3.06 1.62 1.00 .70 518 2.45 1.45 1.00 .69 TH400 2.48 1.48 1.00 The 7004R seems more suitable for a truck or heavy vehicle because of the disappointing lag between 1st and 2nd gear. The 2004R is 27-3/4" overall length. The 7004R is 30-3/4" overall length. The 518 is 38-1/4" overall length The TH400 is 28-1/4" overall length. (Short tailshaft) The 2004R is most dimensionally compatible with the floor/trans tunnel |
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Questions are powerful tools...what's in your toolbox?
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uncljohn
AMC Addicted Joined: Jan/03/2013 Location: Peoria AZ Status: Offline Points: 5394 |
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I personally would not use a final drive ratio any steeper than a 3.15:1 and would take a serious look at obtaining a 2.87:1 if I could find one.
Right now I am planing to use a 2.73:1 which is a bit taller than I like but it is in the car and in good shape. I will worry about replacing it if or when it breaks. |
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70 390 5spd Donohue
74 Hornet In restoration 76 Hornet, 5.7L Mercury Marine Power 80 Fuel Injected I6 Spirit 74 232 I-6, 4bbl, 270HL Isky Cam |
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budryzer
AMC Addicted Joined: Mar/15/2012 Location: Toms River, NJ Status: Offline Points: 758 |
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Hmmnn Thanks for all the info. I will now look into the 2004r as well.
I didn't even consider it before but I like the numbers. The 518 is really long comparatively... |
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1968AMX Stroked 369
"UNCLE SAM" tribute 04 H2 04 BMW 325 A/W 95 Ultralight Hobbycopter 85 CR500 x 2 and 13 other open Class Bikes 77 Hercules Chinook Flt Lead Prev 1970AMX390/4spSonicw/mask&3Gremm's |
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Rogue401
AMC Addicted Joined: Nov/26/2010 Location: New York Status: Offline Points: 1279 |
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I've talked about in other posts, but I have a 200R4 on a 401 in an American using an Advance Adapters kit with a lockup TC and a 3:54 rear. It's a great highway cruiser. THe biggest issue is a dipstick tube, moving the crossmember back because the trans mount is about 6" to the rear and getting the carb linkage and TV cable right. It's critical and controls the transmission throttle pressure. My original SC based exhaust wouldn't clear the trans sides
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AMXFSTBK390
AMC Addicted Joined: Oct/22/2013 Location: SF Bay Area Status: Offline Points: 3489 |
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I found getting the carb linkage and TV Cable the easiest part of the conversion. Takes a few minutes if you have done it before. I used Bow Tie Overdrives EZ TV Cable Kit for a Holley 600 cfm. The 3:54 rear gears are an excellent choice. Yes the trans mount is a bit rearward but easy to fix with a drill or welder. I did have to route my exhaust differently by notching the cross member. I also added a bung to the oil pan to monitor the 2004R fluid temperature. All a labor of love. |
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Questions are powerful tools...what's in your toolbox?
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Rogue401
AMC Addicted Joined: Nov/26/2010 Location: New York Status: Offline Points: 1279 |
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Yes, The Bow Tie Overdrives looks like a great kit and the way I would go now. I did mine about 1998 before anything was available. I had the Quadrajet off the donor car and copied the leverage and linkage as best I could. I recently used a Jegs correction kit for an Edelbrock and that worked OK. I now have Demon carbs and they are supposed to have the correct pivot built in. We'll see...
I would also try to start with a 200R4 from a Monte SS or Turbo Buick Regal. They have the best parts to start with. A better front pump, valve body and governor I think. I couldn't find one at the time and used a V8 Olds station wagon and upgraded it.
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carnuck
AMC Addicted Joined: Mar/31/2010 Location: Seattle Status: Offline Points: 3942 |
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I have 4.10s in the '68 Travelall to go with the 290/AW4 I was planning to run before I decided to go TH400 instead.
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Got an Eagle?
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farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19612 |
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With OD a 2.87 or 3.15 gear isn't enough. I tried using a 3.08. If I had planned on cruising at 80-85 a lot it might have been okay, but the engine wasn't turning enough to produce good power even at 70. It had adequate power for first gear, but when I switched to a 3.55 gear it had much more "spunk" in 1-3 and got 2 mpg better at 70-75 (which is my top cruising speed... except for rare occasion). Remember, a 0.70 OD gear cuts a 3.15 axle to the equivalent of a 2.20 axle (multiply OD gear ratio by axle... I realize you know that John, but others may not). With a higher stall converter you can make that work, but the engine has to turn higher to go up hills and accelerate, which means it burns a bit more gas. But if you already have a higher stall converter (2500 or so) then the high gear might be an economical choice. My brother built his 52 Ford with 2.73 axle, 3000 rpm stall, and a standard Ford C-6 trans (351C engine). It works with that combo -- good performance and decent mileage. With a standard stall converter mileage sucked! He was going to go to a lower gear but a friend who builds converters told him he could fix it for him for about the same cost as a set of gears (not including installing price!) and less trouble (we can pull a trans and swap converters, would have to take the axle to someone to set the gears up right).
Most OD applications with stock converters (1500 or so stall) use a 3.5x gear or lower. Depends on all the usual things -- engine size/power, vehicle weight, tire size, etc. |
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Frank Swygert
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