Another 9" rear end question
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Another 9" rear end question
Hello again, thanks for the responses on the last 2 questions I had! OK, I bought a rear end out of whats supposed to be a 1970 ford F100 to put in my 49 F1. The axles measure 61 1/4, the spring posts are the right distance apart and the right widths. Now the problem I noticed after I got home: It measures aproximetly 4" wider measuring from the drivers side than the passenger side measuring to the driveshaft. The original rear end measures about 2" longer. Did I get the wrong rearend? Im assuming so but whats it from? Heres what the tag said: WDM - AG -1MB on top and 3 00 9 343A on the bottom. Thanks again, Frank
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From: Kalispell, MT
I don't have a list of rear codes, but I do know Ford made a lot of variations in the 9" axle. As long as the overall length is 61 1/4" you are good. Only consideration is room for your exhaust. Actually, the offset is good for U-joint longevity.
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From: Agua Dulce, So. Calif.
Originally Posted by mtflat
I don't have a list of rear codes, but I do know Ford made a lot of variations in the 9" axle. As long as the overall length is 61 1/4" you are good. Only consideration is room for your exhaust. Actually, the offset is good for U-joint longevity.
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From: Agua Dulce, So. Calif.
Originally Posted by 55forder
Overall length meaning from mounting plate, to mounting plate?
sorry to jack yer thread, hehe.
55forder
sorry to jack yer thread, hehe.
55forderEd ke6bnl
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Thanks for the info. I was just trying to figure out if it is from a 57-72 ford f100. You never know about those junkyard finds. I said 1970, my mistake, its supposed to be out of a 1972. Thanks, Frank
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From: San Diego
ke6bnl, what is the width of your rearend from flange to flange ? My 9" is 58", and the guys at bobsf100 told me Id be ok, what do you guys think? My axles and drums are still at the shop, or Id put em on and measure myself. Thank you!
55forder
55forder
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From: Kalispell, MT
'57 - '72 measure 57" flange to flange. Your's will only offset your tires toward the fenders by 1/2" each side, so you should have plenty of room.
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From: Agua Dulce, So. Calif.
Originally Posted by 55forder
ke6bnl, what is the width of your rearend from flange to flange ? My 9" is 58", and the guys at bobsf100 told me Id be ok, what do you guys think? My axles and drums are still at the shop, or Id put em on and measure myself. Thank you!
55forder
55forderMy rear end out of the 69/70 mustang is 61 1/4 from wheel mounting surface to wheel mounting surface this is what I am using in my 50 f1 street rod. I have one out of a 70 bronco old style and is 58 in from wheel mount surface to wheel mount surface. With the mustang 9" rear I was able to mount my 8x17 american torque thrust II on with the standard back spacing and mount 275x60x 17in tires 29" overall diameter. it all fits under the rear wheel wells.
Ed ke6bnl@juno.comFrom backing plate to backing plate it measure 54" Ed ke6bnl
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Painterman,
You bought a correct rear end. The reason the the axleshafts are different lengths is to account for the offset of the ring and pinion inside the center section. The important code on the tag is the 300 9. This indicates a 9 inch pinion and a 3:00 to 1 ratio. (If it read 3.50 9, it would be a a 3:50 to 1 etc if the tag read 8 instead of 9 ie 300 8 , it would indicate an 8 inch rear end) The other numbers refer to "other things" such as 2 or 4 pin case etc. These numbers are of little value in the real world. When I made a similar change on my 55 I found that the pinion was about one inch shorter. Be prepared to lengthen your drive shaft. (I'm not positive in your specific case as I have no specific knowledge of the 49 rear end. You will also have to use 3 inch U bolts which means new or modified spring perch plates. The fact the tag was still on the axle is a good sign. The rear end possibly has never been apart. Tags usually indicate minimal disturbances to the innards. Switching the rear end is worth the hassle.
You bought a correct rear end. The reason the the axleshafts are different lengths is to account for the offset of the ring and pinion inside the center section. The important code on the tag is the 300 9. This indicates a 9 inch pinion and a 3:00 to 1 ratio. (If it read 3.50 9, it would be a a 3:50 to 1 etc if the tag read 8 instead of 9 ie 300 8 , it would indicate an 8 inch rear end) The other numbers refer to "other things" such as 2 or 4 pin case etc. These numbers are of little value in the real world. When I made a similar change on my 55 I found that the pinion was about one inch shorter. Be prepared to lengthen your drive shaft. (I'm not positive in your specific case as I have no specific knowledge of the 49 rear end. You will also have to use 3 inch U bolts which means new or modified spring perch plates. The fact the tag was still on the axle is a good sign. The rear end possibly has never been apart. Tags usually indicate minimal disturbances to the innards. Switching the rear end is worth the hassle.
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From: Illinois
Ford trucks from the mid 70's used a 1" longer yoke. Swapping to one of them will alleviate having to lengthen the driveshaft. Be sure you know how much torque is required for proper preload no the pinion bearing. It is important to the life of the bearings.
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