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Author Topic: Gremlin / Newport Question Update  (Read 13075 times)

dana44

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Gremlin / Newport Question Update
« Reply #210 on: June 15, 2014, 10:12:33 AM »

Gearvendors will cost you more than $2500 and a whole lot of modifications, so it is less expensive to get either a 4spd auto transmission or a set of 3.23s. 3200rpm for 3.55s is about right, close to the speed of my Dakota in 4th.
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68 Charger 440 6pac/02 PT Cruiser/63 TR4 2.5 5spd/39 Nash Business Coupe/95 Dakota Sport 3.9 5spd/81 Z28/ USN Retired

Steve

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Gremlin / Newport Question Update
« Reply #211 on: June 15, 2014, 02:22:31 PM »

Polaraco seems to be much lower
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dana44

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Gremlin / Newport Question Update
« Reply #212 on: June 15, 2014, 05:17:30 PM »

Yes, but you have that overdrive on the 4spd transmission, mine runs 5th gear at 2400rpm at 70mph, too. The .75ish overdrive gives you a 2.66 final drive on 3.55s, which really drops it down.
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68 Charger 440 6pac/02 PT Cruiser/63 TR4 2.5 5spd/39 Nash Business Coupe/95 Dakota Sport 3.9 5spd/81 Z28/ USN Retired

Steve

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Gremlin / Newport Question Update
« Reply #213 on: June 15, 2014, 06:10:42 PM »

Yeah OK.  BUT!  You're talking 800 RPM.  I'm talking out of OD.  If I remember 3rd gear was like 2600 with the 323's. 
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dana44

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Gremlin / Newport Question Update
« Reply #214 on: June 15, 2014, 06:58:46 PM »

Yes, and with the 3.55s, it is around 3200rpm. So you are right, but the reference is the 3.55 rpm speed being a little bit of a problem on the street.
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Snotty

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Gremlin / Newport Question Update
« Reply #215 on: June 16, 2014, 09:39:30 AM »

Quote from: dana44
Yeah, that is a decent price as long as they are in good shape. Assembled in a third member would be really good, if you have to install, the bearing kits are around $125 on top of it. I prefer 3.23s over 3.55s on the street, but really like 2.73s for the highway speeds, or a good overdrive. The second advantage of the 2.73s is keeping the rear tires from spinning so easily from a stop, so tires are saved a bit, and being able to hit 60mph in first gear is kind of cool, too. Hard to do that with 3.55s, but 3.23s are a good alternative between the two.

It's a complete 3rd member, 489 case.  We were running a 2.76 open out of my Newport when we had the wrong length axles.  The top end was fantastic, but opening acceleration sucked.  (However, that built 401 would cook the tires if you wanted.  Jerry did a huge burnout in front of Aldersgate one day!)  We had a 3.23 but it was damaged when we first built the car by using the axles that were too short.  I think the 3.23s will be a great medium ground.
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dana44

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Gremlin / Newport Question Update
« Reply #216 on: June 16, 2014, 09:55:02 AM »

OH, I agree with the bottom end killer for the 2.73, but that is what keeps you out of trouble more than anything. 3.23s are a good compromise, works great in my Charger until I want to start cruising above 80mph, then I wish the rpm was down a little lower for longevity overall, and a little better mileage, too. Overdrive fixes that, but not sure if I want to modify the driveline tunnel yet, but that's a future issue.
 
As far as the damage you talked about, the parts/pieces are easily swapable from any known good center section, leave the pinion alone along with the ring gear, maybe replace the bearings and grab the spline pieces needed from another rear end to correct the "mistake".
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68 Charger 440 6pac/02 PT Cruiser/63 TR4 2.5 5spd/39 Nash Business Coupe/95 Dakota Sport 3.9 5spd/81 Z28/ USN Retired

firedome

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Gremlin / Newport Question Update
« Reply #217 on: June 17, 2014, 04:24:19 AM »

Didn't Mope make a 2.9x something, sort of a middle ground?

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azblackhemi

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Gremlin / Newport Question Update
« Reply #218 on: June 17, 2014, 05:42:18 AM »

Imperials had 2:94's.
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Snotty

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Gremlin / Newport Question Update
« Reply #219 on: June 17, 2014, 09:14:25 AM »

The '62 New Yorker Steve bought from me has 2.93s.  A sweet gear for that car that returns 18 MPG.  And, you can still burn the tires if you so desire!




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Snotty

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Gremlin / Newport Question Update
« Reply #220 on: June 17, 2014, 09:17:55 AM »

Quote from: dana44

That was what we did with that set.  "Big Chris" Fredricksen took the open 3.55 third member I had and using the center section from the 3.23 he built the 3.55 SG that is currently in the Grem.  When I picked it up he gave instructions to not install that one until I got the correct axles.  I made that swap over a year ago but have not really liked them.  MPG dropped from 19 to around 8 for one thing!
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dana44

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Gremlin / Newport Question Update
« Reply #221 on: June 17, 2014, 03:12:34 PM »

Yeah, that's what happens when you get out of the sweet spot. On the other side of that, a good porting of the heads and intake would help that. I got my PT Cruiser (different engine, sure, same concept), from 30mpg at 70mph and 24mpg at 85mph before porting to being able to maintain 29mpg at 90mph, so a worthwhile correction of the port and chamber design.  I have found this to be an across the board correction, not a specific design.
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Snotty

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Gremlin / Newport Question Update
« Reply #222 on: June 21, 2014, 10:14:27 AM »

I got that 3.23 third member from the guy in San Jose.  He wouldn't drop one dollar on his price.  Even so, I can sell the 3.55 for more than I paid for this one.  That won't be too bad.
I had fun when he asked me what it was going into.  I told him to guess.  Ha!!!  He never chose correctly although he named ever Mopar ever built!  Nice guy!
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Snotty

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Gremlin / Newport Question Update
« Reply #223 on: July 23, 2014, 02:30:28 PM »

I still don't know if the joint gave out or the rear-end locked suddenly. I doubt the latter because the wheels never grabbed. I suspect the problem was the joint. Upon inspection it had little to no lubricant in it. A dry needle bearing could have caused it to explode.

As of today the car has a new u-joint, new u-clamps and bolts, and is now running a 3.23 sure-grip instead of the 3.55 one. The sheared bolt and the unknown of the breakage led me to this decision. Never liked those gears anyway - gas mileage sucked and the motor always ran hot. I like the way it drove today. Not that much of a difference, but I have not had it on the freeway yet.

I also swapped the thermostat as well as drilled a 1/8" hole in the new one that is a 195* version. After driving a few miles the temp never went above 197. Prior it would hit 200+ at the end of a lap around the block, and that was with a 165* thermostat. Here's hoping!
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dana44

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Gremlin / Newport Question Update
« Reply #224 on: July 24, 2014, 11:44:30 AM »

Good deal, and I always drill the 1/8th inch hole in thermostats. It is large enough to allow air to make its way out and purge, yet small enough to prevent it from allowing too much fluid to pass and prevent the engine from warming up. Yes, the 3.23s will be a little happier in there, too. Unless you have 78 series or LT tires and overdrive, drinking extra gas for no reason, especially these days, isn't worth it if you aren't on the track regularly.
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