3.9 diffs
12-02-2008, 09:10 AM
#1
Former Sponsor
Thread Starter
Join Date: Mar 2007
Posts: 2,595
Likes: 0
Received 0 Likes
on
0 Posts
3.9 diffs
...i noted on both my front and rear diff it has 3.9 on them whats the difference from std??....Any stronger/more reliable...i noted a strengthening plate too on the front.
12-02-2008, 09:12 AM
#3
No stronger, just lower geared, so brings the gears closer together, potentially making it accelerate quicker.
Top end speed will be lowered of course, but will still be higher than is ever really needed on the road IMHO!
Downside is revs when cruising on the motorway are increased.
Top end speed will be lowered of course, but will still be higher than is ever really needed on the road IMHO!
Downside is revs when cruising on the motorway are increased.
12-02-2008, 10:19 AM
#4
20K+ Super Poster.
iTrader: (1)
Join Date: May 2003
Location: Essex... and Birmingham!
Posts: 21,512
Likes: 0
Received 0 Likes
on
0 Posts
I might have to disagree with Mike slightly
and think that because of the way the Gearing is lowered it takes stress off the tranmission in first gear and therefore does increase reliability slightly if you are launching it.
3.9 gearing is great mod and one of best things I had done to the Sierra
and think that because of the way the Gearing is lowered it takes stress off the tranmission in first gear and therefore does increase reliability slightly if you are launching it.
3.9 gearing is great mod and one of best things I had done to the Sierra
12-02-2008, 10:21 AM
#5
Originally Posted by Porkie
I might disagree Mike slightly
and think that because of the way the Gearing is lowered it takes stress off the tranmission in first gear and therefore does increase reliability slightly if you are launching it.
3.9 gearing is great mod and one of best things I had done to the Sierra
and think that because of the way the Gearing is lowered it takes stress off the tranmission in first gear and therefore does increase reliability slightly if you are launching it.
3.9 gearing is great mod and one of best things I had done to the Sierra
Taking weight or power out of the car will also help lengthen a diffs life if launched a lot for example.
Trending Topics
12-02-2008, 10:52 AM
#8
20K+ Super Poster.
iTrader: (1)
Join Date: May 2003
Location: Essex... and Birmingham!
Posts: 21,512
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Mike Rainbird
Originally Posted by Porkie
Sorry it was Ima who mentioned reliabilty. Thought it was Mike. 
Through excessive wanking
Thread
Thread Starter
Forum
Replies
Last Post
DavidK
Ford Sierra/Sapphire/RS500 Cosworth
1
27-09-2015 02:55 PM