Towing Capacity?
Thread Starter
|
Posting Guru
Joined: Jan 2013
Posts: 1,933
Likes: 0
From: VA
Towing Capacity?
I've been trying to figure out the towing rating for my truck. It's a 1988 F-350, standard cab, long bed. It has a GVWR of 10,000 pounds, but I can't find a GCWR number on the door jam or title. Does anyone know what it is?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
You can't calculate GCWR from anything on the door it's something that is set by the manufacturer based on the powertrain combo and is found in the owners manual. My '90 owners manual says a 460/C6/4.10 has a GCWR of 18.5K for a max trailer weight of 12.5k depending upon the travelling weight of the truck, and for 4.63 gear that goes to 22k and 16k. There is no entry for 4.56 gears and the above numbers assume stock tire sizes, 33's and 4.56 equates to a 4.33 with stock rubber so your actual towing capacity falls somewhere between 12.5k and 16k or about 14k.
Thread Starter
|
Posting Guru
Joined: Jan 2013
Posts: 1,933
Likes: 0
From: VA
You can't calculate GCWR from anything on the door it's something that is set by the manufacturer based on the powertrain combo and is found in the owners manual. My '90 owners manual says a 460/C6/4.10 has a GCWR of 18.5K for a max trailer weight of 12.5k depending upon the travelling weight of the truck, and for 4.63 gear that goes to 22k and 16k. There is no entry for 4.56 gears and the above numbers assume stock tire sizes, 33's and 4.56 equates to a 4.33 with stock rubber so your actual towing capacity falls somewhere between 12.5k and 16k or about 14k.
Thanks Paul
Thread Starter
|
Posting Guru
Joined: Jan 2013
Posts: 1,933
Likes: 0
From: VA
I'm glad that you brought up 4.63 gears. A PO did the gear swap and I've never actually known if the gears were 4.56 or 4.63. There's such a small difference that it's hard to tell... At 60 MPH with my current tires it would only be about a 40-50 RPM difference, so I've never figured it out. I'll have to find that out.
Thread
Thread Starter
Forum
Replies
Last Post
tarynlca
1987 - 1996 F150 & Larger F-Series Trucks
3
Jan 18, 2018 11:39 AM
Thomas A
1987 - 1996 F150 & Larger F-Series Trucks
12
Oct 30, 2005 02:35 AM
