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#565157 - May 28th 2012 2:44 pm Dynotech Replacement Driveshaft (Upgrade)
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
Howdy everybody, It has been a while since I have have been on here, well I have myself a project coming up next week. As you already know I have a 1995 Ram 2500 Van, has Chrysler 9.25 axle with 3.55 gear, custom built 46RH, and the legendary 5.2L, so on so forth. As stupid as it may sound trying to make this van into a performance machine (lol). But why not? It would be fun!
Well after many years of service my stock driveshaft has finally began to show it's faults, vibrations, bad rust, so on. So I called up the gentlemen at Dynotech and ordered myself a custom shaft but it's quite the upgrade from stock.

I ordered a custom made 4140 DOM Steel Shaft, 4" X .083" with a Spicer Cast Slip Yoke, Spicer 1350 Solid Body U-Joints, and like all Dynotech Shafts they are balanced at a minimum of 5,000 RPM to a maximum of 8,000. This replacement shaft is much lighter then stock so maybe I will see an improvement with launch and possibly long term fuel economy.

What makes this upgrade special is the fact that the stock driveline uses Chrysler 7290 U-Joints and my new shaft uses 1350's. So part of this wonderful project is replacing my pinion yoke with a Forged Steel, Victory Performance 1350 Pinion Yoke for the Chrysler 9.25, a very hard to find part but not impossible. This is a major upgrade and a very special upgrade as finding 1350's on a Chrysler 9.25 isn't very common especially when married to a 46RH, more popular among the straight 727's but generally with a Dana 60 Axle.

As I have just ordered the driveshaft this past Friday, Dynotech will not be able to begin making it until Tuesday due to holiday weekend. The sales rep was very kind and informed me it would probably ship on Thursday or Friday of this week (yay).

Once I get the driveshaft I will post pictures of the it. I also have a photo of the pinion yoke somewhere.

So stay tuned to this thread as I update it with photos of my work. First step will be replacing the pinion yoke.

Since last Christmas I have:
Rebuilt transmission
Replace Rear Shocks
Replace fuel pump, tank mount hardware and rubber filler tube grommet
Replace axle bearings and seals
Re-wrapped ECM harnesses
And so on.


The stock shaft has gone straight to hell with rust,




Yep, I need new exhaust system that's for dam sure. But a little at a time gets it done.

But subscribe to this thread and fallow along.

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amazon add parts
#565317 - May 29th 2012 9:22 am Re: Dynotech Replacement Driveshaft (Upgrade) [Re: RamVan2500]
NateNCBV Offline

Administrator

Registered: August 23rd 2005 12:00 pm
Posts: 20415
Loc: Brooklyn Park, Maryland, USA
I think my '94 needs the driveshaft rebalanced. Luckily there is a shop about 5 miles from my house that can tackle the job. Just need to set aside some time to do it.
_________________________
Nate Breece
2%
North Chesapeake Bay Vans
--------------
1994 Dodge B250 Elk Conversion (5.2L/A518)
2008 Dodge Caravan (3.8L)

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#565366 - May 29th 2012 12:26 pm Re: Dynotech Replacement Driveshaft (Upgrade) [Re: NateNCBV]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
Probably does, 18 year old driveshaft probably rusted to hell. I noticed that Dodge didn't start using the aluminum shafts until like 1998 I think. Just don't be surprised if they say they cannot balance it.

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#565370 - May 29th 2012 12:26 pm Re: Dynotech Replacement Driveshaft (Upgrade) [Re: RamVan2500]
NateNCBV Offline

Administrator

Registered: August 23rd 2005 12:00 pm
Posts: 20415
Loc: Brooklyn Park, Maryland, USA
yeah...the vibration is really noticeable around the 60-75mph range.
_________________________
Nate Breece
2%
North Chesapeake Bay Vans
--------------
1994 Dodge B250 Elk Conversion (5.2L/A518)
2008 Dodge Caravan (3.8L)

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#565373 - May 29th 2012 12:35 pm Re: Dynotech Replacement Driveshaft (Upgrade) [Re: NateNCBV]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
I noticed vibrations around the 50MPH and up range, when I was on the highway doing 65 it was horrible, part of the experience was my rear shocks were out but hell when I put the rear end of my van up on jack stands, put the transmission in drive I could see the driveshaft moving up and down slightly. I used the old white crayon trick and well shaft had excessive run out. But man I cannot wait until I get this dynotech shaft installed, I am pumped to put a 100% vibration free race performance shaft on this van, should ride like it's floating on a cloud. And I had just replaced my shocks a few weeks ago so it should be real smooth... Can't wait!

I have a vibration chart I got from a Chrysler manual, it's helpful with trying to determine where vibrations are originating from. Both audio and mechanical vibes. I'll see if I can upload it.

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#565374 - May 29th 2012 12:37 pm Re: Dynotech Replacement Driveshaft (Upgrade) [Re: NateNCBV]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
Oh and be careful driving with that shaft, you could damage the tail housing seal not to mention the tail housing.

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#565386 - May 29th 2012 1:10 pm Re: Dynotech Replacement Driveshaft (Upgrade) [Re: NateNCBV]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA

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#565445 - May 29th 2012 7:49 pm Re: Dynotech Replacement Driveshaft (Upgrade) [Re: RamVan2500]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
New Pinion Yoke, very few companies make 1350 pinion yokes for the chrysler 9.25, you can use a pinion yoke from the chrysler 8.75 but be cautious of the spline count. anyways here is the yoke i got a while ago, this is a stock photo.


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#565823 - May 31st 2012 3:36 pm Re: Dynotech Replacement Driveshaft (Upgrade) [Re: RamVan2500]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
Dynotech just shipped the driveshaft. Weighs 26 lbs, it's very long, aprox 59" CL-CL and 4" diameter.

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#566841 - June 05th 2012 8:40 pm Re: Dynotech Replacement Driveshaft (Upgrade) [Re: RamVan2500]
RamVan2500 Offline
enthusiast

Registered: February 01st 2012 8:12 pm
Posts: 239
Loc: Florida, USA
shaft is all installed, you can see photos by looking at this public album http://www.facebook.com/media/set/?set=a...mp;l=0b84ff8c46

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