1973 340, want more power.
- Thread starter Richard McLaughlin
- Start date
-
Why not just blueprint a 71 340 and put an Eddy Air Gap, Holley 750 and a set of big tube headers on it? DONE. Over and out. Roger Wilco.
nm9stheham
Well-Known Member
It all goes back to tradeoffs and what you like:
Higher gears =
1) More torque to the rear wheels so better acceleration at all speeds
2) Higher revs from the engine so possibly more discomfort. Take the suggestion to go out and cruise at 50-55 in 2nd gear with your present low 3's gear ratio; that will simulate how high the engine revs will be at 65-70 MPH with a 3.91 gear ratio in 3rd gear.
3) Lower fuel economy
IMHO, do this test, and then sleep on it for a while. No need to feel pushed one way or the other. There are other options to do that have not been really discussed here, and you may want to know those first and then mull it over and end up prioritizing things differently.
Richard McLaughlin
1974 Duster 340
About to buy the 3.91 gears. I have someone local who wants to sell a 8 3/4 dodge 1970 391 sure-grip... for $1000 Canadian. Which works out to about $700 Canadian less than Webby or dr diff
Good deal??
Good deal??
Dumb question semi intelligent answer;
Sure it is on the dollar aspect, unless it is a total piece of garbage and needs $1500 in rebuilding costs.
Sure it is on the dollar aspect, unless it is a total piece of garbage and needs $1500 in rebuilding costs.
Richard McLaughlin
1974 Duster 340
Hey guys.
Just paid for the goods from Webby.
3.91 sure grip.
Looking forward to it!
Thanks for all your help.
Richard
Just paid for the goods from Webby.
3.91 sure grip.
Looking forward to it!
Thanks for all your help.
Richard
Richard McLaughlin
1974 Duster 340
Yes,
All shipped and on its way. Hope to get it in within the next few weeks.
All shipped and on its way. Hope to get it in within the next few weeks.
Richard McLaughlin
1974 Duster 340
leblanc
member 2883
Looks like a bucket of bolts...expensive bolts. The downer with 3.91 gears or higher is fuel costs.
Richard McLaughlin
1974 Duster 340
Yeah, will burn more gas for sure.
nm9stheham
Well-Known Member
That is an interesting way to ship a gear set...
Richard McLaughlin
1974 Duster 340
Gears home (New Brunswick, Canada)
Being installed May 15th.
I'll let you know how I like them!
Being installed May 15th.
I'll let you know how I like them!
If you find the 3.91's make freeway driving unfriendly, you might consider a gear vendors overdrive. Spendy for sure but it'll get yer R's down to where you will hear the stereo at freeway speeds.
Gear Vendors under/overdrive auxiliary transmissions Hot Rods, Dodge 3-Speed Automatic Muscle Car/Street Rod/Restoration.
Richard McLaughlin
1974 Duster 340
Yes, I have looked into that before. About $3,000 if I remember corectly. Maybe down the road after my egine is pumped up as well.
Thanks
Richard
Richard McLaughlin
1974 Duster 340
Hey guys,
Got the car back today with the 3.91 sure grip.
Works great! Definatly glad i didnt go less than a 3.91, I can handle the extra vibrations etc.. Didnt bother me at all...
Thanks everyone for you help!
Richard
Got the car back today with the 3.91 sure grip.
Works great! Definatly glad i didnt go less than a 3.91, I can handle the extra vibrations etc.. Didnt bother me at all...
Thanks everyone for you help!
Richard
yellow rose
Overnight Sensation
I see a set of 4.56's in your future. Once you go 4.56 you'll never go back!
Richard McLaughlin
1974 Duster 340
Hahahahaha. Wow. That seems pretty high
I was also going about 75 mph at some points, not sure how the 4.56 would handle that!
-
