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Author Topic: c4 won't shift in first if in drive.  (Read 850 times)
68mustang405
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« on: January 09, 2010, 10:14:55 pm »
This is killing me and I'm about ready to sell the whole car cause of it.
The c4 is in a 68 mustang it's got a 70 valve body with a transgo 40-2.
It is 26 spline input and output shaft.
stock stall
tci bands and clutches with 5 clutches in the forward clutch pack.
H servo

Problem: damn thing won't start in first if put in drive, will start in first if you take it from reverse or park to 1. Starts off in second in drive and second in 2. Also have the annoying 2-3 flare. Type f fluid in it now, switch from mecon and it still had same symptoms. Replaced rear servo. I'm at my wits end. Is it something in the valve body maybe? Disassembled the valve body and checked to make sure all the pistons moved fine. I'm thinking a bleed over in the vb. If someone has some info please help and explain it in detail please.
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68 Mustang 93 302 block, gt40 heads, tfs1 cam, 1.7 rr, performer intake, holley 600 vacuum secondary, c4 with tci internals, 8in 2.79 open differential
90lxcoupe
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« Reply #1 on: January 10, 2010, 12:04:40 pm »
What type of shifter & how is it adjusted?  Does this thing have a kick down?
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68mustang405
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« Reply #2 on: January 10, 2010, 05:21:36 pm »
Yes it has a kickdown and no it's not the shifter. It's stock 68 mustang floor shifter and if i shift it from park to 1 it will go into one so I know it's not the adjustment. The kickdown is adjusted properly, it won't actuate unless the pedal is to the floor. Btw I don't see how that would have anything to do with it because if it was incorrectly adjusted it would stay in first not stay in second and not kicke down to first if that makes sense. Sorry for the long post I am just writing what I'm thinking right now.
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68 Mustang 93 302 block, gt40 heads, tfs1 cam, 1.7 rr, performer intake, holley 600 vacuum secondary, c4 with tci internals, 8in 2.79 open differential
69 Merc
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« Reply #3 on: January 10, 2010, 05:59:04 pm »
Subscribing to learn.   Thanx!
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Robert's 1969 Mercury Montego MX is a 3750LB daily driven (75MI/WK) 9.5" SBF 363W (+.060" over), 9.5:1CR, RPM 2.02", Comp XE-274HFT, RPM Air-Gap, 1" four-hole + 2" open phenolic spacers, Holley HP VAC 750CFM carb, 34* @ 1800RPM total timing, Accufab 1-3/4" x 3" LT headers, manual VB C4, 10" - 3500 stall TC, 4.56 geared 9", Detroit TrueTrac Locker, 31 spline axles, sub-frame connectors, driveshaft safety-loop, 3/8" welded chain torque strap, custom leaf spring suspension, traction bars.

Future motor -- Jim "Woody" Woods and Jay Allen will be helping me build a scary fast Southern Californian street daily driven SBF 445" motor with -- Jim's FordStrokers' prepped Dart SHP iron block @ 4.155" bore x 4.1" stroke, all forged bottom-end, internally balanced, Super Vic intake, combined with Jay's Camshaft Innovations' custom billet TLSR camshaft, Comp #838 lifters, 10.xx:1CR, TW TEA CNC 205 heads, 7/16" Comp Ultra-Gold rockers and a Pro Systems Dominator carb.
68mustang405
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« Reply #4 on: January 10, 2010, 06:21:11 pm »
it's weird, but i've looked all over the net and NOONE has this problem, so I'm almost pos. it is a valve body bleeding accross. If anyone has the vb manual or explains what each port is for I would appreciate it if someone posts it up..
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68 Mustang 93 302 block, gt40 heads, tfs1 cam, 1.7 rr, performer intake, holley 600 vacuum secondary, c4 with tci internals, 8in 2.79 open differential
jayh
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« Reply #5 on: January 10, 2010, 06:35:41 pm »
is the vacuum modulator good? is the governor stuck?

join this forum and ask over there-

www.clickclickracing.com
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347HO
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« Reply #6 on: January 10, 2010, 06:58:57 pm »
Sounds like a governor weight is stuck
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Quote from: PapaGeno21 on August 09, 2009, 04:34:39 pm

... it was REALLY revving at like 4K...
Quote from: ranchopower on November 09, 2009, 11:04:30 pm
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?

When I say "junk" I'm talking about parts or setup in general...  not say POS.
knowitall
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« Reply #7 on: January 10, 2010, 07:17:39 pm »
 Popcorn on Chair
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« Reply #8 on: January 10, 2010, 07:39:32 pm »
If it is the VB or the governor or your modulator that is giving you your problem then may I suggest to go to a full manual VB?  I have one and they are a serious blast to drive!   Always full on line pressure = fastest shift and less (slippage and flaring) EVERY shift.  No more cables and no more governors and no more stinkin' modulators, etc!!!  
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Robert's 1969 Mercury Montego MX is a 3750LB daily driven (75MI/WK) 9.5" SBF 363W (+.060" over), 9.5:1CR, RPM 2.02", Comp XE-274HFT, RPM Air-Gap, 1" four-hole + 2" open phenolic spacers, Holley HP VAC 750CFM carb, 34* @ 1800RPM total timing, Accufab 1-3/4" x 3" LT headers, manual VB C4, 10" - 3500 stall TC, 4.56 geared 9", Detroit TrueTrac Locker, 31 spline axles, sub-frame connectors, driveshaft safety-loop, 3/8" welded chain torque strap, custom leaf spring suspension, traction bars.

Future motor -- Jim "Woody" Woods and Jay Allen will be helping me build a scary fast Southern Californian street daily driven SBF 445" motor with -- Jim's FordStrokers' prepped Dart SHP iron block @ 4.155" bore x 4.1" stroke, all forged bottom-end, internally balanced, Super Vic intake, combined with Jay's Camshaft Innovations' custom billet TLSR camshaft, Comp #838 lifters, 10.xx:1CR, TW TEA CNC 205 heads, 7/16" Comp Ultra-Gold rockers and a Pro Systems Dominator carb.
68mustang405
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« Reply #9 on: January 10, 2010, 08:25:54 pm »
vacuum mod is brand new, we cleaned everything out so  i'm sure the governors good too when I pull the valve body I'll check it. But will someone explain why either one of those would cause it to NOT GO INTO FIRST? Sorry for my caps but just making sure everyone is getting this. It makes no sense to me why either of these would cause it to not go into first. If it wasn't upshifting it woudl be another story, one determines part shifts and another determines full throttle shifts I know. And sorry no thanks on the full manual vb. Can't afford it even if it was 20 bux. A little more info, the screws are 2 1/2 out on the low reverse band and 1 on the forward band. All line pressures were good except reverse was a lil low but this was before the piston was replaced so that could have changed.


Sorry for my long winded posts but i feel like i need to explain myself otherwise I might get some flak like some of my other buddies did on this forum. Lot of useful info so I don't wanna mess that up. 
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68 Mustang 93 302 block, gt40 heads, tfs1 cam, 1.7 rr, performer intake, holley 600 vacuum secondary, c4 with tci internals, 8in 2.79 open differential
juiced coupe
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« Reply #10 on: January 10, 2010, 09:18:52 pm »
Have you adjusted the vacuum modulator? If its not adjusted correctly, you may be shifting out of first almost immediately.
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68mustang405
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« Reply #11 on: January 10, 2010, 11:23:53 pm »
Quote from: juiced coupe on January 10, 2010, 09:18:52 pm
Have you adjusted the vacuum modulator? If its not adjusted correctly, you may be shifting out of first almost immediately.

No cause if you shift it from park to first, it feels different then if you start it in drive. You can tell it's starting off in second.
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68 Mustang 93 302 block, gt40 heads, tfs1 cam, 1.7 rr, performer intake, holley 600 vacuum secondary, c4 with tci internals, 8in 2.79 open differential
347HO
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« Reply #12 on: January 10, 2010, 11:39:45 pm »
Well since you friggin disagree with every damn suggestion, just rebuild the piece of shit.
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HUGE thanks to;



Quote from: PapaGeno21 on August 09, 2009, 04:34:39 pm

... it was REALLY revving at like 4K...
Quote from: ranchopower on November 09, 2009, 11:04:30 pm
If I saw that thing in my rear view Im pulling over to let you by, I be scared of that thing Huh? i dont know wich car is uglier ur or mine?

When I say "junk" I'm talking about parts or setup in general...  not say POS.
gtvert90
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« Reply #13 on: January 10, 2010, 11:43:25 pm »
Quote from: 347HO on January 10, 2010, 11:39:45 pm
Well since you friggin disagree with every damn suggestion, just rebuild the piece of shit.
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liljoe07
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« Reply #14 on: January 11, 2010, 12:14:39 am »
LOL, I don't think I've posted all day.
But that deserves a Spt at PC, and that's for sure going in my signature. Grin
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Quote from: 347HO on January 10, 2010, 11:39:45 pm
Well since you friggin disagree with every damn suggestion, just rebuild the piece of shit.
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