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304 flexplate not mating to 727 torq. converter
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#1 | |
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Registered User
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304 flexplate not mating to 727 torq. converter
Hey guy's
I need some help with this one please! I am trying to drop a 304 into a 1984 j-10 that used to have a 360. ( I know it sounds like a wimp out on displacement but $$$ was a big factor in this one, and I got a reman 304 for a killer price). I did get a 304 flex plate and h/balancer and tried to drop the engine in but the flex plate does not have holes that line up with the torq. converter bolt holes? I thought I was in good getting a 304 flex plate out of a 1975 cj5 but I am now stumped! The tranny is a 727 and it's in great shape. Thanks for any help!! Mike
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#2 |
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Vendor
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A 1975 CJ would have a TH400 for a transmission so the flexplate won't bolt up to the 727.
You need to get a new flexplate. Try a 1977ish AMC Hornet with a 304. The AMC cars in the 70's used the 727 transmissions so this should work out for you.
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BJ's Off-Road http://www.bjsoffroad.com Specializing in Full-Size Jeeps -- 1984-1991 Grand Wagoneers, 1963-1988 J-trucks, 1974-1983 Cherokees and 1963-1983 Wagoneers! Check us out on Facebook! www.facebook.com/bjsoffroad |
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#3 |
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Thank you for your help!
I will go on a search for that flex plate asap, and I will remember BJ's off road ! Thanks again!! |
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#4 | |||
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Cool as Ice...
Join Date: Dec 2006
Location: Sterling Heights, Michigan
Posts: 2,727
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Quote:
Quote:
http://www.matadorcoupe.com/trannyspecs.htm Quote:
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This is how NAXJA Midwest Chapter elected officials like to treat their resident users and former multi-year supporters. <--- Click "Classifieds" under my avatar to see all my parts (mostly CJ & XJ) currently for sale on JeepForum! |
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#5 | |
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Vendor
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Quote:
I show a 72 Matador and a 77 Hornet use the same flexplate on a 304.
__________________
BJ's Off-Road http://www.bjsoffroad.com Specializing in Full-Size Jeeps -- 1984-1991 Grand Wagoneers, 1963-1988 J-trucks, 1974-1983 Cherokees and 1963-1983 Wagoneers! Check us out on Facebook! www.facebook.com/bjsoffroad |
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#6 | |
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Cool as Ice...
Join Date: Dec 2006
Location: Sterling Heights, Michigan
Posts: 2,727
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Quote:
This is exactly why I pasted in that data from Matadorcoupe.com, which is found on almost all the other AMC car sites (such as AMC Hornet.com). It says the 998 was used behind the 304, except for in HD applications. Using Rock Auto as a reference, the same part # is listed for the flexplate in the 74+ Hornets and Madators (Dorman part # 04302) and it actually says "TF-727", which conflicts with the 998 information. The second issue is that the same flexplate part number (04302) is also listed for the 360. Tooth count, OD, and pitch are the same, but the 304 and 360 should have different balance, correct?
__________________
This is how NAXJA Midwest Chapter elected officials like to treat their resident users and former multi-year supporters. <--- Click "Classifieds" under my avatar to see all my parts (mostly CJ & XJ) currently for sale on JeepForum! |
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#7 |
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Registered User
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304/360 are close in balance. 401 is hugely different and 6 cyl is zero balanced. The 727 and 999 use the same pattern on the flexplate. 904/998 is smaller.
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#8 |
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Registered User
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Hey guys, just scanning the net for info, ran accross your discussion and wanted to add a bit of info.
They're rarer, but there were serveral models of AMC in the 70's that came with the HD option of a 304 and a 727 transmission. I personally have the flexplate and 727 that I pulled from a 304 1974 Hornet with the HD option. If you're scouting salvage yards probably the quickest way to know what your looking at is to check the transmission pan shape (if the tranny's still in). If the tranny's out then it's going to be tough. All the Chryslers look similar at a quick glance but the pan on the 727 is different from the others. ![]() The top picture is what a 727 looks like so you'll know it got the right flex plate. The bottom picture is the shape for the 904, 998 and 999. Good luck with your rebuild. |
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#9 |
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Registered User
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BTW, the 304 and 360 are close but not balanced the same. Don't mix the flex plates.
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#10 |
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Registered User
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cjs in the pre 76 all had manuals? am I wrong? When I looked at puting the t400 in mine it was a tad to short, like i would have to run a chain to the rear axle. now a jeepster (commando) had a t400 but not a cj. Please tell me if I am wrong. now dj, might but a cj?
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Most people don't see the light till they feel the heat. |
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#11 |
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Registered User
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I realize this an old thread but i would like to stir it back up. Im currently working on putting a 727 behind my 304 in my 75 cj5. Ive got my driveshafts all made and transfer case adapted, but the only thing holding me up is trying to find the correct flexplate and torque converter for the 304 727 combination. Ive searched several salvage yards with no luck, and if i attempt to order it new the dealers want to give me the same flexplate part number for a 360 and 304, but as we know that is incorrect due to the balancing. Anybody know where to find these parts?
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#12 |
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Cool as Ice...
Join Date: Dec 2006
Location: Sterling Heights, Michigan
Posts: 2,727
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The AMC flexplates used in Jeeps from 80-86 are dual-pattern for both the 998 and 727 - meaning they started with the same blank (same diameter and tooth count) and then balanced them differently for the 258/998's in CJ's and the V8's with the 727 in FSJ's. You can do two things:
__________________
This is how NAXJA Midwest Chapter elected officials like to treat their resident users and former multi-year supporters. <--- Click "Classifieds" under my avatar to see all my parts (mostly CJ & XJ) currently for sale on JeepForum! |
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#13 |
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Registered User
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here are two places that sell a flexplate that they list as working with both 304 and 360.
Performance American Style Shopping Cart - Product description 4 Wheel Drive Hardware Search both places are reputable and should know what they are talking about. Just curious what people think about it
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1980 CJ7 (only by title) Chev 350, 700R4, D300, lockers, 33 swampers 1986 CJ7 (only by title) AMC 360, tf999, D300, lockers, 35 baja claws |
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#14 |
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Registered User
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bulltear has the flexplate you need.or at least the web site says.
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#15 |
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Registered User
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I'll check that out. Thanks dajeeps
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1980 CJ7 (only by title) Chev 350, 700R4, D300, lockers, 33 swampers 1986 CJ7 (only by title) AMC 360, tf999, D300, lockers, 35 baja claws |
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