318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > Differentials


Differentials Limit Slip, gear ratio discussions.

» Recent Threads
As Green as the Touge - ...
06-18-2016 02:47 PM
Last post by Beemernut
Today 05:00 PM
44 Replies, 22,846 Views
Rusty coolant
06-16-2019 06:57 AM
Last post by MisterM52
Today 01:04 PM
1 Replies, 253 Views
M44 strange water leak...
05-18-2019 09:01 AM
Last post by MisterM52
Today 12:59 PM
8 Replies, 1,150 Views
Exhaust sound/video...
03-26-2006 07:07 PM
Last post by MisterM52
Today 06:33 AM
124 Replies, 71,928 Views
M-tech bumper - avus...
05-05-2019 02:41 PM
Last post by cmoore
Yesterday 05:26 PM
12 Replies, 1,942 Views
Happy Birthday NYBmw96ti
Yesterday 05:00 AM
Last post by 1996 328ti
Yesterday 05:00 AM
0 Replies, 163 Views
Track ti build (M52)
03-05-2016 03:00 PM
Last post by spidertri
06-16-2019 12:42 PM
58 Replies, 28,830 Views
Rudolph the Red 318ti
05-06-2019 10:49 PM
Last post by thenjnick
06-16-2019 07:10 AM
17 Replies, 2,255 Views
Another Swapped Ti
11-19-2016 06:43 PM
Last post by anassa
06-16-2019 06:17 AM
83 Replies, 39,469 Views
1997 318ti with cali...
09-30-2018 03:29 AM
Last post by kcr97cali
06-15-2019 04:35 PM
8 Replies, 2,542 Views
Reply Share/Bookmark
Thread Tools Display Modes
Old 02-23-2018, 11:51 PM   #1
Join Date: Dec 2017
Location: NoVA
Posts: 48
iTrader: (0)
Default Half Shaft Boot Info

So I know there is a lot of confusion out there as to what half shafts work and which one don't. Additionally, the availability/cost of replacement boots is not the greatest, but I come and offer some solutions/insight for you.

Background: My 98 Ti with 98k (yes that's right) on the clock needed new cv boots (stock diff, stock half-shafts). BMW and Meyle along with other aftermarket parts are available, but I'm dirt cheap and just wanted to buy the boots and clamps themselves and then splurge on Redline Grease (CV2). So I ordered a set of boots from ebay and of course they are only half correct. The purchased set comes with a taller, skinnier boot and a shorter, fatter one. From the factory, BMW had installed just the taller, skinny boot both outboard and inboard - fail #1. Because many other things weren't going right (mis-manufactured engine mounts, leaky selector rod seal, etc) I just up and ordered a set of rebuilt half-shafts from Heri through Rock Auto and surprise, surprise, they are too long as has been posted here many times.

So now I have new half-shafts that don't fit and half way rebuilt old ones that I can't finish. After many phone calls to Heri's tech support and to the guy that sold me the boots, I can confidently say that I think I figured out what happened (well - partially).

Boots: If you still have original half shafts that have never been rebuilt, you will likely have boots that are identical (between inboard and outboard). If you feel so inclined to just buy bare boots and clamps, you will need BT-314 boots with 35mm and ~68mm clamps. If your half shafts have been rebuilt, it is likely that you have dissimilar boots and you'll need BT-314 and BT-367 boots along with 35mmx2, ~68mmx1 and 74mmx1 clamps. (I used 62mm clamps that were supplied in my kit - they were incredibly tight and could only be pinched a little bit before they would try and slide the boot back off the cap. Sometime during production, BMW decided to no longer produce the smaller diameter cap (likely because they started having to produce beefier half-shafts for other models) and only kept the large diameter cap on hand, leading to the difference in boots. The ebay store I purchased from is bestbuyautomotiveparts - they are awesome to deal with and will more than likely build a custom order for you. They sent me two new boots and new clamps when I had the improper size issue.

Half-shafts: As has been posted here before (http://www.318ti.org/forum/showthread.php?t=41535) GSP has half-shafts (NCV27994) that will work for the Ti (I didn't the thread before I ordered). I spoke with Heri why their half isn't correct and it ends up being a catalogging issue. I guess some of their engineers are confused about what model uses what length half-shaft...Heri themselves say that the Ti and Z3 1.9l cars use different half-shafts. We obviously know better. Heri has a 23 3/16 half shaft (model 78105) in their inventory, but because they do not have a car listed against the model number, nobody is able to order it (such as Rock Auto). So, while I'm still trying to work with Heri on getting their catalog correct to help us 318ti'ers out, go out and #1 request the 78105 to put more pressure on them to produce one and then #2 buy the GSP one if you can't get the one from Heri. No, I don't have an affiliation with Heri, but from my research, Heri brand half-shafts are about 50% cheaper. The one I received looks really good too by the way - no junk there. I have also attached the drawing from Heri for the proper half-shaft for your comparison.
Attached Files
File Type: pdf BM-8318A-new.pdf (334.6 KB, 92 views)

Last edited by sirius815; 02-23-2018 at 11:54 PM.
sirius815 is offline   Reply With Quote


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
CV-Axle Half Shaft from Advanced Auto Parts... R111S Differentials 6 11-16-2016 04:01 AM
Blown drive shaft... Beach Transmission 21 09-28-2011 04:25 AM
Half shaft broken! pnosker Differentials 15 10-16-2009 12:26 AM
Auto to manual swap info request Turboready Lounge 18 10-02-2008 06:23 AM
Drive shaft questions??? M4YTY Engine Swaps 4 05-01-2008 10:04 PM

All times are GMT +1. The time now is 06:23 PM.

Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2019, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 67.69 k/77.28 k (12.40%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.