Looking at maybe changing converters, current one was built by a friend 25yrs ago. Its a 8 inch and he refreshed it this spring but I feel its holding car back, it should be mph in the 130s and so far has only gone 126. Feels like its on a dyno all the time, never pulls rpm strong.

Who makes a good 727 converter in the 55-6500 stall range. This is for my AMC but there is really no difference in converter but the ring for starter.

What ET does it run?

Could be slipping.

i would call Lenny at Ultimate Convertor. I got one from Lenny last year.

I gained 2 mph, 3 tenths, and my 60' jumped to 1.55 from 1.70.

I changed nothing else but convertor.

It ran 10.53 at 126 in bowling green this fall at drag week. 1.51 60, car weighs 3500lbs, 4.44 gear and 28 inch tires.

Not so worried about the 60 foot but that it wont rpm right, always seems like its loaded, never two strokes or gets on the cam. Also mph is low, the 1/8 mile times and mph are better than at 1/4. This engine should be pushing it to 133 or so.

Plenty of fuel, I thought that last year and redid the fuel system, no change, wide band had it at 9-1 afr leaned it out and am close now.

Lenny a UCC here also...great service and product

Cut and pasted from Moparts fastest section. Seems like you are right where you should be mph wise. I'm down some running 10.06@130mph but 4.88 gears, a small carb, and a 550 lift cam will kinda peter out.

10.27 @ 129.9b 68 fb cuda 2980 lbs, 9.0x30 tire,leaf springs. 500”, 4150 carb, indy ez-1s Footin it cudasteve68
10.31 @ 131.85, 1.36 60', Kevins440, 493RB, Indy 440-1's, stock '63 cross ram, 3300lb.
10.32 @129.01 1.45 60' DaveS 73 Swinger 446 E-heads, Mega-Squirt EFI SS springs Staightline Perf. Cam
10.325@ 128.36, 1.405 60', weedlayer, ugly year, sb Challenger, 3430#
10.33 @ 130.00, 1.52 60' Bubba, '80 Mirada, 440, 3630#
10.38 @ 128 mph, 1.44 60', 68 Valiant 100, 408, Indy 360-2s, pump gas, 3100 lbs, 340_Dart
10.40 @ 129.1, a10sec70cuda, 446 cid, 3700#, all motor street car, through mufflers on 10.5"
10.43 @127.23 wyoming, ran at Vegas 4010' density air, 64 Savoy, 493 max wedge 3510 lbs
10.43 @ 126.41 1.42 60’,70 Superbee 451,3500 lbs,SS sprgs,Std port EZ's, super451b
10.45 @ 127, StrokerPost 67 Dart Sedan, 414 SB, 3290#, factory iron heads, all motor.
10.50 @ 129 KOS Nick 70dart driven to the track,trw flat top,stock rod 446,iron indy head 1050dom 3500#.
10.50 @ 126.68 1.40 60' dustyswinger 73 duster 416sb pumpgas ported cast iron smogger heads 3250# all motor
10.500 @ 131.05,03 Dakota R/T Turbocharged 408, rtspeedemon
10.50 @ 128.00,1979 Chrysler 300,Bown 408 SB,727,4:56 gears Crizila
10.50 @ 127.00, daron 73 duster, sb street car
10.52 @ 130, 400 stk bot end E heads,w squeeze, pump gas,BB70DUSTER
10.54 @ 124, 2933lbs 590cam,1968 dart 365ci mildly ported iron heads on alcohol Dare dude
10.57 @ 126, 1.45 60’3650#, 66 Coronet440,9in slks.cal tracs,no pwr aders, theman440.
10.58 @ 125,1.44 60’,70 dart,493,pump gas,eddy rpm's,solid cam,493 Dart
10.59 @ 127, 1.49 60' 70 Bee 440 eddy rpm heads
10.59 @ 124, 1.45 60', mopar65, 65 Plymouth 3500# 446 w/E heads
10.6167 @ 133.65, 4190#.030 over 360, Sgl Turbo, 99 Dakota, Duner
10.62 @ 125mph,69 Cuda, 394"SB IMM ported Eddies,IMM flat tappet, Pump gas, 275 Radials, imin269
10.64 @ 124.50, 1.49 60', RVA, 440ci 3165#
10.65 @ 123.43 1.45 60ft,11secdart 68 Dart,3160lbs,crate 360 W2 heads,904,s/s springs,10 1/2 inch slicks,mufflers,
10.66 @ 126 Mr. Belvedere, 66 Belvedere 470, 3725#
10.66 @ 124.84, 1.51 60'3800lb 67 GTX, 512ci.,s/s springs, dana 60, 4.10 gears, jkgtx
10.67 @ 128.3, 1.55, 72 Chally, Auto/Pump Gas Street Car, 3850, full exh, DOT's *WeDgiE*
10.68 @ 128.3, 1.54 60', TimMoffett, 69 Charger, 4-speed Street Car, 3900# with full exhaust
10.68 @ 125, 10secGTX 67 GTX 3670#
10.68 @ 125, 73 Str/Strip Dart stock 440/727 pump gas ET Streets Mopar65
10.68 @ 123 mph. 76' Volare 406" iron head magnum motor, 904 trans, 3300 lbs on 9" Radials. Hyd roller camshaft -- StandOnIt
10.69 @ 126.46, MFR440, '65 Coronet, 446, Max Wedge, Beachy Eng, A&A Trans, 1.50 60', 3535 lbs.
10.71 @ 126.12, gj69charger, '69 charger, 500cid

I went from 29.5 to 28 w 4,30 gears and my car didn't like that one bit.what kind of rpms you turning at the stripe w those 28 tall tires?

you should be running 10.0-10.10's with your combo.

I ran 10.85 @ 126 mph off the trailer, no tuning.
436'' w2 heads, 13.1, tunnel ram with 650's, 660/632 lift and 277/288@.050. 4.30 gear, 28'' tire. 3800 lbs

first thing I would change is convertor. i picked up with my swap in convertors. my car felt sluggish and i knew it had a lot more in it.

Turns right at 6900-7000 at the stripe.

Little tougher at that weight but low 10`s as stated seem doable w/ EVERYTHING being right...........

What is your 1/8 mile et and mph ? Ron