Engine/Transmission (1994 - 1998) Broken input shaft??????

[zilla5.9]

Hello and Happy New Year!!
I was pulling away from an intersection last saturday ,So I rolled into the throttle a little bit , Got to about 20 psi and BANG! the RPM's spiked hard and no more pull . I turned into a parking lot with the momentum I had left checked under the truck, Clean and dry no funny sounds in drive or reverse just revvs up like neutral... park still locks the output shaft .
When it broke there was definitely a metalic snap that sent a shutter through the truck...
I've had this transmission for about 4 years and never thought it would have handled my abuse . Its all BD parts including a first generation TC only rated at 300 HP and under . I want to get a DTT or ATS complete trans but I dont know how bad off it really is... Any info would be greatly apreciated I gotta get my baby going again ... Thanx in advance... .

 

[Bill Lins]

Is your truck 4wd? If so, it sounds like the snap ring may have broken in your transfer case- do a search in the archives.

 

[Bill Lins]

Just saw something in the February edition of 4-Wheel & Off-Road- it's called the Transfer Case Saver.



Sez it takes less than an hour to install and "prevents expensive internal damage to gears and components due to grinding from excessive shaft end-play".



It is available for NP 231, 241, and 243 transfer cases.



www.gillysproducts.com

 

[zilla5.9]

Actually my transfer case is OK I just had it gone through last month . The truck still can lock itself in park and can be moved in any other gear selection , I did however read that article and considered the modification , anything to keep these trucks safe is worth it!!!! sorry I didnt write back sooner I've been doing reasearch on transmissions . I think I'm going to go with a fully built swap out trans from DTT or ATS so far I've been liking the ATS for some of its features but you never know the DTT trans is also a sweet piece of equipment. .
Thanks for the replys
Later

 

[Bill Lins]

zilla- what broke in your transmission?

 

[zilla5.9]

It was the input shaft... But it was the stock one... The new one will be billet steel.

 

[Reb.B]

there are two ways u can go, ... buy another stock one at $35, this comes with input shaft, hub and new clutchs, already assembled or call The Converter Shop up in Chino, CA. They sell billet input shaft and hub for $450, . . which is $145 cheaper than others.

 

[Reb.B]

Sorry, the number for The Converter Shop is 800-782-6757.

 

[Stefan Kondolay]

Zillias 5. 9 reb. b





The difference you are seeing in the input shaft pricing is because of the materials & processes being used.



One is from 4340 material, and DTT's is machined from 300 Maraging AMS 6514 material & then heat treated & precision ground.



We chose the higher quality materials & processes because of the additional torsional strength it allows and enables us to offer a lifetime warranty on the shafts. We personally felt we could not offer a lifetime warranty if we used the 4340 for input shafts.



Depending on your application and hp numbers remember to make sure you carefully consider thei internal components



When we build transmissions for 700hp or 800hp trucks the input shaft one of the smallest issues when you consider some specialized components we designed.



As obviously i am biased a good source for comparison is Piers, he has high hp trucks out there running a variety of companies transmissions.

 

[Reb.B]

I'm gonna try a couple of these shafts by the convertor shop, i'll ask for what metal they use. Both shafts are going in pretty extreme trucks. Both drivers are crazy, . . one will be drag raced and the other will pull over 30,000 gross lbs and be around 500 rwhp. I'll let u know how it goes. Thanx Stephan for filling us in on what DTT uses and the differences between the two shafts. I understand the extreme that u have to go to to keep your high horsepower custumers happy and keep a good name in the transmission business.

 

[chrleb1]

here is some info on the 300M alloy. 300M is a low alloy, vacuum melted, steel of very high strength. Essentially it is a modified AISI 4340 steel with silicon, vanadium and slightly greater carbon and molybdenum content than 4340. 300M has a very good combination of strength (280 to 305 ksi), toughness, fatigue strength and good ductility. It is a through hardening alloy. Applications for 300M steel are those that require strength in the 290 - 300 ksi range, such as aircraft landing gear, high strength bolts and airframe parts.

The hub that they are selling is made out of 4140 alloy, which is a very strong metal also. Some crankshafts are made out of this. So if it is strong enough for aircraft landing gear, i am pretty sure it will handle quite a bit of horsepower.

 

[Reb.B]

did some checking on The Converter Shop input shafts, and their shafts are made from the 300 M alloy too and they send them to a heat treating place to take care of that, . . not sure if its done all at one time, but probably is.