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1972 Rhd Daily Driven 5Pw Promotive Build In The Usa.


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#61 duds100

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Posted 26 September 2018 - 10:47 AM

I did have to change the LSD output to the hardy spicer type. I don't have a measured increase in clearance sorry. It is still tight down there but I have had no issues since converting and with the pot joints no matter what I did it kept snagging / melting them. My guess is probably a 5mm radius reduction but that really is a guess just from memory

 

From your 65mph, 6.5K cruise speed in 6th I can confirm you are on a 3.4:1 ratio CWP differential. 

 

This is your gearing 67mph @6.5k in 6th calculated)

 

44926090841_e953580320_b.jpgevalone38 by Dudley Waldron, on Flickr

 

Let me know if you want to utilise any other sprocket setups / gearing changes & i'll run it through the calc :-)

 



#62 kjwithers

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Posted 27 September 2018 - 04:26 AM

Do you guys know is this a common issue with the cv boot? I will be starting a build soon and want to avoid any hiccups early on.

#63 duds100

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Posted 03 October 2018 - 04:13 PM

I'd urge you to build it with hardy spicer joints if you can. The diff outputs are different than ones used for pot joints though so you may have to source those too. 



#64 evolone38

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Posted 08 October 2018 - 04:34 AM

@duds100 

Thanks for the calc!

I have had good luck so far since I have clearanced the header and then did my own boot making, I have not had 1 burn mark since.  I do have Spicers in the back of my mind, just would suck to no longer be able to use my custom driveshafts. If I was to do it from scratch, Force Racing has the stuff I would liquidate fundage on, titanium goods make me smile.


Edited by evolone38, 08 October 2018 - 04:41 AM.


#65 evolone38

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Posted 08 October 2018 - 11:20 PM

This is a short, colorful story of automotive autopsy, in picture form. I did not make it to the Autocross event, is the punchline.😭

Promotive is helping in gather me up my innards and get me back in gear.
Thanks Philip!

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#66 duds100

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Posted 10 October 2018 - 12:20 PM

Sorry to see that. I hear Pro-Motive have had some new super strong diff units cast now so hopefully you'll get one of those. 



#67 Aceslow

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Posted 17 October 2018 - 01:05 AM

I bought the new cast lower. Do they have a different cast upper diff housing? I just yanked the diff out to replace the lower. It has not gone back in yet. Hate to do that job twice.

#68 GreaseMonkey

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Posted 17 October 2018 - 07:34 AM

Oh dear! That does not look nice. 



#69 duds100

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Posted 17 October 2018 - 04:03 PM

I bought the new cast lower. Do they have a different cast upper diff housing? I just yanked the diff out to replace the lower. It has not gone back in yet. Hate to do that job twice.

Not sure, maybe it's only the lower bit they have had made then



#70 evolone38

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Posted 29 October 2018 - 08:21 PM

Update on my gear..
Promotive sent me some goods in which I put into motion with a slight upgrade on the diff side of things.
Bottom line is, it is terrorizing the tarmac again!

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#71 cad13

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Posted 31 October 2018 - 02:58 AM

Care to explain the upgrade on the diff. ?

#72 evolone38

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Posted 31 October 2018 - 08:08 PM

Care to explain the upgrade on the diff. ?

Well since the diff only holds 140ML and I had a diff issues, I increased the capacity which made it easier to check and drain the diff. 34 iinches of 8an hose holds about 160ML so, I set up for about 220ML total in diff, with a buffer zone for less mess. I can drain and fill the diff without a hassle now.



#73 cad13

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Posted 01 November 2018 - 01:53 AM


Care to explain the upgrade on the diff. ?

Well since the diff only holds 140ML and I had a diff issues, I increased the capacity which made it easier to check and drain the diff. 34 iinches of 8an hose holds about 160ML so, I set up for about 220ML total in diff, with a buffer zone for less mess. I can drain and fill the diff without a hassle now.

That sounds like a good idea.
Do you know if your issues were caused by oil starvation ?
I had a drain plug fitted to my cover for easy draining.

Edited by cad13, 01 November 2018 - 01:59 AM.


#74 evolone38

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Posted 02 November 2018 - 04:48 AM

@  cad13

I saw your case, looks sweet and having the drain at the bottom is the proper configuration. I figured with the hose I can drain and fill remotely without getting underneath my lowrider..lol 

I figure more oil availability is not a bad thing, ease to maintain and since I have had the diff out three times...can't hurt. I like to daily the thing ..but now winter is coming I will have a few months to sort it straight.



#75 cad13

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Posted 08 November 2018 - 04:12 PM

@ evolone38
I know what you mean ... winter months are here!
Where I'm from in Quebec the snow comes early.
Can’t wait to get the mini reliable enough to daily in the summer tho.
By the way your mini is looking great!




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