What is a "workhorse p30" ?

darin338 wrote:

harold1946 wrote:

darin338 wrote:
Purchasing a 2000 Newmar Dutch Star. Owner says it has a GMC 7.4 which I believe is a 454?

However, the carfax states it is a "workhorse" p30, which I always thought the workhorse was Chevy 8.1, not GMC 454?

Also, I've searched and searched and searched and have yet to find another 2000 Dutch Star with a 7.4 GMC in it. They either all have the V-10 or are diesel.

That chassis was made durring the transition when Workhorse purchased the motorhome chassis devision from GM. Workhorse completed the orders for the 7.4 and then switched to the 8.1 and Allison transmission combination.
The 2000 more than likely has the GM transmission also.

Thanks! So is this a drawback, or plus over the 8.1 powertrain?

Dont know that I would call it a drawback.
The 8.1 produces more horsepower and coupled with the Allison transmission is considered by most to be a great improvement.
There are thousands of motorhomes with the 7.4, GM tranny combinations on the road with satisfied owners.
Having owned both,I prefer the 8.1 Allison 1000 6 speed combination with the grade brake.