br0k3N18 Posted August 18, 2009 Report Posted August 18, 2009 Can someone tell me the width of the 8 3/4 rear under a 52 1/2t...i could go measure, but didnt know if someone knew off the top of there head Quote
alberts truck o matic Posted August 20, 2009 Report Posted August 20, 2009 I beileve it to be 62 inches from wheel mounting surface to wheel mounting surface. The rear end is not a Chrysler 8 3/4 if it is stock. Quote
br0k3N18 Posted August 20, 2009 Author Report Posted August 20, 2009 Why isnt it a factory chrysler one?:confused: Quote
Merle Coggins Posted August 20, 2009 Report Posted August 20, 2009 I believe he meant that it's not an 8 3/4 axle. It may look similar, but it's smaller. Merle Quote
br0k3N18 Posted August 20, 2009 Author Report Posted August 20, 2009 Really? its not an 8 3/4? I guess I assumed it was because it looks identical to the one thats under my dads superbee... Quote
Allen I. Posted August 21, 2009 Report Posted August 21, 2009 If it is an 8 3/4, someone has been there already and made some changes. Quote
Merle Coggins Posted August 21, 2009 Report Posted August 21, 2009 I tried to find some pictures of 8 3/4 axles for comparison, but this is all I could find. Here are some pics of an original axle in my 3/4 ton truck. (1/2 ton axles are the same) Not an 8 3/4" Axle. A dead give away between the two, besides their size, would be the wheel hub. An 8 3/4 would have a flanged axle shaft which would contain the wheel studs. The original axle would have a tapered axle to which the brake drum fits and is held on with a castle nut. Merle Quote
Phil Martin Posted August 21, 2009 Report Posted August 21, 2009 Lookat Merles chart. Looks like its an 8 3/4 to me. It says 72 and older 1/2 ton pickup and looks the same. Quote
br0k3N18 Posted August 21, 2009 Author Report Posted August 21, 2009 i thought the EXACT same thing.... Quote
grey beard Posted August 21, 2009 Report Posted August 21, 2009 Can't you guys read Merle's post? The axle outer ends are vastly different. One is tapered with a keyway for the drum and the other is flanged and the drum just slips over the wheel lugs and axle center. How can anyone believe they are the same? Do you understand this axle terminology? Quote
br0k3N18 Posted August 21, 2009 Author Report Posted August 21, 2009 meh funk it, I dont care if its a 8 3/4 or not, just wantin to know the width of it so i can swap one in! Quote
Phil Martin Posted August 22, 2009 Report Posted August 22, 2009 Read what it says about 8 3/4. Cars have studs trucks are taoered and use bolts. But aren't they still both 8 3/4? Quote
Tony WestOZ Posted August 22, 2009 Report Posted August 22, 2009 (edited) Ok a 1952 Pilothouse truck diff is 62 1/4" wide from where the wheel bolts too. It is an 81/4" diff. It looks the same as the 8 3/4" in this chart. This is an 8 1/4" diff. The easyest way to tell the difference between 8 1//4" and 8 3/4" is to count the nuts (bolts, studs whatever) that hold the pumpkin ( carrier whatever) in. 8 1/4 have 11 nuts, 8 3/4 have 10. The other way to tell is the two top nuts are closer together on an 8 3/4 than they are on an 8 1/4. Taperd axles (where the drum goes on) were used on 8 3/4 diffs from 57 to 64. Flanged axles started in 65. There are also 3 pinion sizes from 57 to 72 but thats an other story. Sorry for pinching the pics from another poster but they are better than the ones I have. Forgot, there were some 8 3/4 that had an 4" pcd instead of the usual 4 1/2" pcd. They are rare but it pays to check. Edited August 22, 2009 by Tony WestOZ 1 Quote
48Dodger Posted August 22, 2009 Report Posted August 22, 2009 (edited) Spring perches on a 1968 Super Bee 8 3/4 is 44 inches center to center. Spring perches on a 1950 PH Truck is 44 1/2. The big difference is the spring perches are on the bottom of a 1968 pass vehicle. The 50 Truck has the perches on the top. 1950 Truck axle's two top studs are 3 1/4 apart, the 1968 is 2 inches apart. The flanges on a 1968 8 3/4 are flat on top, the flanges on the 50 are round. the next 3 pictures are a 1950 orginal axle set-up The next 2 pictures are of a 1968 8 3/4 axle housing Next pictures are of a 1950 truck with a 60's 8 3/4 modified with the 1950 style perches put on top. 48D Edited August 22, 2009 by 48dodger Quote
Frank Elder Posted August 22, 2009 Report Posted August 22, 2009 meh funk it ------------------------------------------------------------- Huh? Quote
Warren Nielsen Posted August 22, 2009 Report Posted August 22, 2009 My turn. The original axles in the pilot house series of trucks look A LOT like the Mopar 8 3/4 rear ends. They ARE different. At a glance you would think they are the same. Sorry, but no. The 8 3/4 rears came in a variety of widths depending on year of manufacture and end use. -Tapered axles (where the drum goes on) were used on 8 3/4 diffs from 57 to 64. Flanged axles started in 65. There are also 3 pinion sizes from 57 to 72 but thats an other story- Very true. MOST of the charts you find about axles widths and spring perch spacing do not address those used in trucks and vans. Now to the original question. As best as I could measure it, my 52 B3B's original axle measured 62 1/2 inches from wheel mount face to wheel mount face. I installed an 8 3/4 axle from a mid 60s Dodge A100 van. It has a measurement of 61 3/4 inches face to face. I now have access to all new and available wheel cylinders, springs, cables, clips and drums, not to mention 3 different pinion sizes (read that as "strength") new bearings, and a myriad of ratios for your gearing. And it's all Mopar if you are something of a purist like me. Quote
48Dodger Posted August 22, 2009 Report Posted August 22, 2009 When determining if an axle will fit, I consider the spring perches first. I don't think anyone was trying to say the axles were the same, we were going over the differences. Many of us on this forum have changed over to late 60's 8 3/4 axles for the "modern" advantages. The original question was answered a few times. br0k3N18 "meh funk it, I dont care if its a 8 3/4 or not, just wantin to know the width of it so i can swap one in!" yea...swap it in. 48D Quote
Phil Martin Posted August 23, 2009 Report Posted August 23, 2009 I put a 3:21 rearend from 73 dodge pickup in 53 dodge pickup. Used narrower mounts from 53 rearend. . Better ratio and much better brakes as they were wider shoes. I stand corrected on 8 3/4 rearends. Quote
br0k3N18 Posted August 23, 2009 Author Report Posted August 23, 2009 Right on guys, I have access to an 8 3/4 from a 69 Bee...i'll "Test" Fit it and go from there:D Thanks alot for all the help and clearing up the mess, so correct me if im wrong (which is a VERY high possibilty) our trucks come with an 8 1/4? Quote
Tony WestOZ Posted August 23, 2009 Report Posted August 23, 2009 so correct me if im wrong (which is a VERY high possibilty) our trucks come with an 8 1/4? On the 1/2 and 3/4 ton Yes... Quote
Warren Nielsen Posted August 23, 2009 Report Posted August 23, 2009 On the 1/2 and 3/4 ton Yes... But don't confuse it with the 8 1/4 axles shown in the picture/chart in Tony's post of 8-21-09. Those 8 1/4s are totally different than what originally was in your truck Quote
br0k3N18 Posted August 24, 2009 Author Report Posted August 24, 2009 yeah I know, regardless, that rearend combo aint gonna work for what im doin Quote
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